diff --git a/src/composables/widgets/useComboWidget.ts b/src/composables/widgets/useComboWidget.ts
index 00f7eeaf5..588e6b34c 100644
--- a/src/composables/widgets/useComboWidget.ts
+++ b/src/composables/widgets/useComboWidget.ts
@@ -92,8 +92,8 @@ function applyFilenameMappingToWidget(
       const hashValue = widget.value
       if (typeof hashValue !== 'string') return String(hashValue)
 
-      // Try to get human-readable name from cache
-      const mapping = fileNameMappingService.getCachedMapping('input')
+      // Try to get human-readable name from cache (deduplicated for display)
+      const mapping = fileNameMappingService.getCachedMapping('input', true)
       const humanName = mapping[hashValue]
 
       // Return human name for display, fallback to hash
@@ -117,8 +117,8 @@ function applyFilenameMappingToWidget(
     get() {
       if (!Array.isArray(rawValues)) return rawValues
 
-      // Map values to human-readable names
-      const mapping = fileNameMappingService.getCachedMapping('input')
+      // Map values to human-readable names (deduplicated for dropdown display)
+      const mapping = fileNameMappingService.getCachedMapping('input', true)
       const mapped = rawValues.map((value: any) => {
         if (typeof value === 'string') {
           const humanName = mapping[value]
@@ -165,8 +165,8 @@ function applyFilenameMappingToWidget(
 
   // Override incrementValue and decrementValue for arrow key navigation
   ;(widget as any).incrementValue = function (options: any) {
-    // Get the current human-readable value
-    const mapping = fileNameMappingService.getCachedMapping('input')
+    // Get the current human-readable value (deduplicated)
+    const mapping = fileNameMappingService.getCachedMapping('input', true)
     const currentHumanName = mapping[widget.value] || widget.value
 
     // Get the values array (which contains human names through our proxy)
@@ -185,8 +185,8 @@ function applyFilenameMappingToWidget(
     }
   }
   ;(widget as any).decrementValue = function (options: any) {
-    // Get the current human-readable value
-    const mapping = fileNameMappingService.getCachedMapping('input')
+    // Get the current human-readable value (deduplicated)
+    const mapping = fileNameMappingService.getCachedMapping('input', true)
     const currentHumanName = mapping[widget.value] || widget.value
 
     // Get the values array (which contains human names through our proxy)
@@ -210,8 +210,11 @@ function applyFilenameMappingToWidget(
   ;(widget as any).setValue = function (selectedValue: any, options?: any) {
     if (typeof selectedValue === 'string') {
       // Check if this is a human-readable name that needs reverse mapping
-      const reverseMapping =
-        fileNameMappingService.getCachedReverseMapping('input')
+      // Use deduplicated reverse mapping to handle suffixed names
+      const reverseMapping = fileNameMappingService.getCachedReverseMapping(
+        'input',
+        true
+      )
       const hashValue = reverseMapping[selectedValue] || selectedValue
 
       // Set the hash value
@@ -242,8 +245,11 @@ function applyFilenameMappingToWidget(
   widget.callback = function (selectedValue: any) {
     if (typeof selectedValue === 'string') {
       // Check if this is a human-readable name that needs reverse mapping
-      const reverseMapping =
-        fileNameMappingService.getCachedReverseMapping('input')
+      // Use deduplicated reverse mapping to handle suffixed names
+      const reverseMapping = fileNameMappingService.getCachedReverseMapping(
+        'input',
+        true
+      )
       const hashValue = reverseMapping[selectedValue] || selectedValue
 
       // Set the hash value
diff --git a/src/services/fileNameMappingService.ts b/src/services/fileNameMappingService.ts
index 882eb2616..6ade41f6f 100644
--- a/src/services/fileNameMappingService.ts
+++ b/src/services/fileNameMappingService.ts
@@ -8,6 +8,7 @@ export interface FileNameMapping {
 
 export interface CacheEntry {
   data: FileNameMapping
+  dedupData?: FileNameMapping // Deduplicated mapping with unique display names
   timestamp: number
   error?: Error | null
   fetchPromise?: Promise<FileNameMapping>
@@ -88,16 +89,25 @@ export class FileNameMappingService {
   /**
    * Get cached mapping synchronously (returns empty object if not cached).
    * @param fileType - The file type to get cached mapping for
+   * @param deduplicated - Whether to return deduplicated names for display
    * @returns The cached mapping or empty object
    */
-  getCachedMapping(fileType: FileType = 'input'): FileNameMapping {
+  getCachedMapping(
+    fileType: FileType = 'input',
+    deduplicated: boolean = false
+  ): FileNameMapping {
     const cached = this.cache.get(fileType)
     if (cached && !this.isExpired(cached) && !cached.failed) {
+      // Return deduplicated mapping if requested and available
+      if (deduplicated && cached.dedupData) {
+        return cached.dedupData
+      }
       const result = cached.data
       console.debug(
         `[FileNameMapping] getCachedMapping returning cached data:`,
         {
           fileType,
+          deduplicated,
           mappingCount: Object.keys(result).length,
           sampleMappings: Object.entries(result).slice(0, 3)
         }
@@ -113,12 +123,14 @@ export class FileNameMappingService {
   /**
    * Get reverse mapping (human-readable name to hash) synchronously.
    * @param fileType - The file type to get reverse mapping for
+   * @param deduplicated - Whether to use deduplicated names
    * @returns The reverse mapping object
    */
   getCachedReverseMapping(
-    fileType: FileType = 'input'
+    fileType: FileType = 'input',
+    deduplicated: boolean = false
   ): Record<string, string> {
-    const mapping = this.getCachedMapping(fileType)
+    const mapping = this.getCachedMapping(fileType, deduplicated)
     const reverseMapping: Record<string, string> = {}
 
     // Build reverse mapping: humanName -> hashName
@@ -212,6 +224,7 @@ export class FileNameMappingService {
 
       // Update cache with successful result
       entry.data = data
+      entry.dedupData = this.deduplicateMapping(data)
       entry.timestamp = Date.now()
       entry.error = null
       entry.failed = false
@@ -315,6 +328,73 @@ export class FileNameMappingService {
     // Allow retry after 30 seconds for failed requests
     return entry.timestamp > 0 && Date.now() - entry.timestamp > 30000
   }
+
+  /**
+   * Deduplicate human-readable names when multiple hashes map to the same name.
+   * Adds a suffix to duplicate names to make them unique.
+   * @param mapping - The original hash -> human name mapping
+   * @returns A new mapping with deduplicated human names
+   */
+  private deduplicateMapping(mapping: FileNameMapping): FileNameMapping {
+    const dedupMapping: FileNameMapping = {}
+    const nameCount = new Map<string, number>()
+    const nameToHashes = new Map<string, string[]>()
+
+    // First pass: count occurrences of each human name
+    for (const [hash, humanName] of Object.entries(mapping)) {
+      const count = nameCount.get(humanName) || 0
+      nameCount.set(humanName, count + 1)
+
+      // Track which hashes map to this human name
+      const hashes = nameToHashes.get(humanName) || []
+      hashes.push(hash)
+      nameToHashes.set(humanName, hashes)
+    }
+
+    // Second pass: create deduplicated names
+    const nameIndex = new Map<string, number>()
+
+    for (const [hash, humanName] of Object.entries(mapping)) {
+      const count = nameCount.get(humanName) || 1
+
+      if (count === 1) {
+        // No duplicates, use original name
+        dedupMapping[hash] = humanName
+      } else {
+        // Has duplicates, add suffix
+        const currentIndex = (nameIndex.get(humanName) || 0) + 1
+        nameIndex.set(humanName, currentIndex)
+
+        // Extract file extension if present
+        const lastDotIndex = humanName.lastIndexOf('.')
+        let baseName = humanName
+        let extension = ''
+
+        if (lastDotIndex > 0 && lastDotIndex < humanName.length - 1) {
+          baseName = humanName.substring(0, lastDotIndex)
+          extension = humanName.substring(lastDotIndex)
+        }
+
+        // Add suffix: use first 8 chars of hash (without extension)
+        // Remove extension from hash if present
+        const hashWithoutExt = hash.includes('.')
+          ? hash.substring(0, hash.lastIndexOf('.'))
+          : hash
+        const hashSuffix = hashWithoutExt.substring(0, 8)
+        dedupMapping[hash] = `${baseName}_${hashSuffix}${extension}`
+      }
+    }
+
+    console.debug('[FileNameMappingService] Deduplicated mapping:', {
+      original: Object.keys(mapping).length,
+      duplicates: Array.from(nameCount.entries()).filter(
+        ([_, count]) => count > 1
+      ),
+      sample: Object.entries(dedupMapping).slice(0, 5)
+    })
+
+    return dedupMapping
+  }
 }
 
 // Singleton instance
diff --git a/tests-ui/tests/composables/widgets/useComboWidget.test.ts b/tests-ui/tests/composables/widgets/useComboWidget.test.ts
index 526d33928..dd569917c 100644
--- a/tests-ui/tests/composables/widgets/useComboWidget.test.ts
+++ b/tests-ui/tests/composables/widgets/useComboWidget.test.ts
@@ -33,6 +33,158 @@ describe('useComboWidget', () => {
     vi.clearAllMocks()
   })
 
+  describe('deduplication', () => {
+    it('should display deduplicated names in dropdown', () => {
+      const constructor = useComboWidget()
+      const mockWidget = {
+        name: 'image',
+        value: 'hash1.png',
+        options: {
+          values: ['hash1.png', 'hash2.png', 'hash3.png']
+        },
+        callback: vi.fn()
+      }
+      const mockNode = {
+        addWidget: vi.fn().mockReturnValue(mockWidget)
+      }
+
+      // Mock deduplicated mapping
+      vi.mocked(fileNameMappingService.getCachedMapping).mockImplementation(
+        (_fileType, deduplicated) => {
+          if (deduplicated) {
+            return {
+              'hash1.png': 'vacation_hash1.png',
+              'hash2.png': 'vacation_hash2.png',
+              'hash3.png': 'landscape.png'
+            }
+          }
+          return {
+            'hash1.png': 'vacation.png',
+            'hash2.png': 'vacation.png',
+            'hash3.png': 'landscape.png'
+          }
+        }
+      )
+
+      const inputSpec: InputSpec = {
+        type: 'COMBO',
+        name: 'image',
+        options: ['hash1.png', 'hash2.png', 'hash3.png']
+      }
+
+      const widget = constructor(mockNode as any, inputSpec)
+
+      // Check that dropdown values are deduplicated
+      const dropdownValues = widget.options.values
+      expect(dropdownValues).toEqual([
+        'vacation_hash1.png',
+        'vacation_hash2.png',
+        'landscape.png'
+      ])
+    })
+
+    it('should correctly handle selection of deduplicated names', () => {
+      const constructor = useComboWidget()
+      const mockWidget = {
+        name: 'image',
+        value: 'hash1.png',
+        options: {
+          values: ['hash1.png', 'hash2.png']
+        },
+        callback: vi.fn()
+      }
+      const mockNode = {
+        addWidget: vi.fn().mockReturnValue(mockWidget)
+      }
+
+      // Mock deduplicated mappings
+      vi.mocked(fileNameMappingService.getCachedMapping).mockImplementation(
+        (_fileType, deduplicated) => {
+          if (deduplicated) {
+            return {
+              'hash1.png': 'image_hash1.png',
+              'hash2.png': 'image_hash2.png'
+            }
+          }
+          return {
+            'hash1.png': 'image.png',
+            'hash2.png': 'image.png'
+          }
+        }
+      )
+
+      vi.mocked(
+        fileNameMappingService.getCachedReverseMapping
+      ).mockImplementation((_fileType, deduplicated) => {
+        if (deduplicated) {
+          return {
+            'image_hash1.png': 'hash1.png',
+            'image_hash2.png': 'hash2.png'
+          } as Record<string, string>
+        }
+        return {
+          'image.png': 'hash2.png' // Last one wins in non-dedup
+        } as Record<string, string>
+      })
+
+      const inputSpec: InputSpec = {
+        type: 'COMBO',
+        name: 'image',
+        options: ['hash1.png', 'hash2.png']
+      }
+
+      const widget = constructor(mockNode as any, inputSpec)
+
+      // Select deduplicated name
+      ;(widget as any).setValue('image_hash1.png')
+
+      // Should set the correct hash value
+      expect(widget.value).toBe('hash1.png')
+    })
+
+    it('should display correct deduplicated name in _displayValue', () => {
+      const constructor = useComboWidget()
+      const mockWidget = {
+        name: 'image',
+        value: 'abc123.png',
+        options: {
+          values: ['abc123.png', 'def456.png']
+        },
+        callback: vi.fn()
+      }
+      const mockNode = {
+        addWidget: vi.fn().mockReturnValue(mockWidget)
+      }
+
+      // Mock deduplicated mapping
+      vi.mocked(fileNameMappingService.getCachedMapping).mockImplementation(
+        (_fileType, deduplicated) => {
+          if (deduplicated) {
+            return {
+              'abc123.png': 'photo_abc123.png',
+              'def456.png': 'photo_def456.png'
+            }
+          }
+          return {
+            'abc123.png': 'photo.png',
+            'def456.png': 'photo.png'
+          }
+        }
+      )
+
+      const inputSpec: InputSpec = {
+        type: 'COMBO',
+        name: 'image',
+        options: ['abc123.png', 'def456.png']
+      }
+
+      const widget = constructor(mockNode as any, inputSpec)
+
+      // Check display value shows deduplicated name
+      expect((widget as any)._displayValue).toBe('photo_abc123.png')
+    })
+  })
+
   it('should handle undefined spec', () => {
     const constructor = useComboWidget()
     const mockNode = {
diff --git a/tests-ui/tests/services/fileNameMappingService.test.ts b/tests-ui/tests/services/fileNameMappingService.test.ts
index 0e646ca5a..d50a8808a 100644
--- a/tests-ui/tests/services/fileNameMappingService.test.ts
+++ b/tests-ui/tests/services/fileNameMappingService.test.ts
@@ -22,6 +22,181 @@ describe('FileNameMappingService', () => {
     service = new FileNameMappingService()
   })
 
+  describe('deduplication', () => {
+    it('should not modify unique names', async () => {
+      const mockData: FileNameMapping = {
+        'abc123.png': 'vacation.png',
+        'def456.jpg': 'profile.jpg',
+        'ghi789.gif': 'animation.gif'
+      }
+
+      vi.mocked(api.fetchApi).mockResolvedValue({
+        ok: true,
+        status: 200,
+        json: async () => mockData
+      } as any)
+
+      await service.getMapping('input')
+      const dedupMapping = service.getCachedMapping('input', true)
+
+      // All unique names should remain unchanged
+      expect(dedupMapping['abc123.png']).toBe('vacation.png')
+      expect(dedupMapping['def456.jpg']).toBe('profile.jpg')
+      expect(dedupMapping['ghi789.gif']).toBe('animation.gif')
+    })
+
+    it('should add hash suffix to duplicate names', async () => {
+      const mockData: FileNameMapping = {
+        'abc123def456.png': 'vacation.png',
+        'xyz789uvw012.png': 'vacation.png',
+        'mno345pqr678.png': 'vacation.png'
+      }
+
+      vi.mocked(api.fetchApi).mockResolvedValue({
+        ok: true,
+        status: 200,
+        json: async () => mockData
+      } as any)
+
+      await service.getMapping('input')
+      const dedupMapping = service.getCachedMapping('input', true)
+
+      // Check that all values are unique
+      const values = Object.values(dedupMapping)
+      const uniqueValues = new Set(values)
+      expect(uniqueValues.size).toBe(values.length)
+
+      // Check that suffixes are added correctly
+      expect(dedupMapping['abc123def456.png']).toBe('vacation_abc123de.png')
+      expect(dedupMapping['xyz789uvw012.png']).toBe('vacation_xyz789uv.png')
+      expect(dedupMapping['mno345pqr678.png']).toBe('vacation_mno345pq.png')
+    })
+
+    it('should preserve file extensions when deduplicating', async () => {
+      const mockData: FileNameMapping = {
+        'hash1234.safetensors': 'model.safetensors',
+        'hash5678.safetensors': 'model.safetensors'
+      }
+
+      vi.mocked(api.fetchApi).mockResolvedValue({
+        ok: true,
+        status: 200,
+        json: async () => mockData
+      } as any)
+
+      await service.getMapping('input')
+      const dedupMapping = service.getCachedMapping('input', true)
+
+      // Extensions should be preserved
+      expect(dedupMapping['hash1234.safetensors']).toBe(
+        'model_hash1234.safetensors'
+      )
+      expect(dedupMapping['hash5678.safetensors']).toBe(
+        'model_hash5678.safetensors'
+      )
+    })
+
+    it('should handle files without extensions', async () => {
+      const mockData: FileNameMapping = {
+        abc123: 'README',
+        def456: 'README',
+        ghi789: 'LICENSE'
+      }
+
+      vi.mocked(api.fetchApi).mockResolvedValue({
+        ok: true,
+        status: 200,
+        json: async () => mockData
+      } as any)
+
+      await service.getMapping('input')
+      const dedupMapping = service.getCachedMapping('input', true)
+
+      // Files without extensions should still get deduplicated
+      expect(dedupMapping['abc123']).toBe('README_abc123')
+      expect(dedupMapping['def456']).toBe('README_def456')
+      expect(dedupMapping['ghi789']).toBe('LICENSE') // Unique, no suffix
+    })
+
+    it('should build correct reverse mapping for deduplicated names', async () => {
+      const mockData: FileNameMapping = {
+        'hash1.png': 'image.png',
+        'hash2.png': 'image.png',
+        'hash3.jpg': 'photo.jpg'
+      }
+
+      vi.mocked(api.fetchApi).mockResolvedValue({
+        ok: true,
+        status: 200,
+        json: async () => mockData
+      } as any)
+
+      await service.getMapping('input')
+      const reverseMapping = service.getCachedReverseMapping('input', true)
+
+      // Reverse mapping should map deduplicated names back to hashes
+      expect(reverseMapping['image_hash1.png']).toBe('hash1.png')
+      expect(reverseMapping['image_hash2.png']).toBe('hash2.png')
+      expect(reverseMapping['photo.jpg']).toBe('hash3.jpg')
+
+      // Should not have original duplicate names in reverse mapping
+      expect(reverseMapping['image.png']).toBeUndefined()
+    })
+
+    it('should handle mixed duplicate and unique names', async () => {
+      const mockData: FileNameMapping = {
+        'a1.png': 'sunset.png',
+        'b2.png': 'sunset.png',
+        'c3.jpg': 'portrait.jpg',
+        'd4.gif': 'animation.gif',
+        'e5.png': 'sunset.png'
+      }
+
+      vi.mocked(api.fetchApi).mockResolvedValue({
+        ok: true,
+        status: 200,
+        json: async () => mockData
+      } as any)
+
+      await service.getMapping('input')
+      const dedupMapping = service.getCachedMapping('input', true)
+
+      // Duplicates get suffixes
+      expect(dedupMapping['a1.png']).toBe('sunset_a1.png')
+      expect(dedupMapping['b2.png']).toBe('sunset_b2.png')
+      expect(dedupMapping['e5.png']).toBe('sunset_e5.png')
+
+      // Unique names remain unchanged
+      expect(dedupMapping['c3.jpg']).toBe('portrait.jpg')
+      expect(dedupMapping['d4.gif']).toBe('animation.gif')
+    })
+
+    it('should return non-deduplicated mapping when deduplicated=false', async () => {
+      const mockData: FileNameMapping = {
+        'hash1.png': 'image.png',
+        'hash2.png': 'image.png'
+      }
+
+      vi.mocked(api.fetchApi).mockResolvedValue({
+        ok: true,
+        status: 200,
+        json: async () => mockData
+      } as any)
+
+      await service.getMapping('input')
+
+      // Without deduplication flag
+      const normalMapping = service.getCachedMapping('input', false)
+      expect(normalMapping['hash1.png']).toBe('image.png')
+      expect(normalMapping['hash2.png']).toBe('image.png')
+
+      // With deduplication flag
+      const dedupMapping = service.getCachedMapping('input', true)
+      expect(dedupMapping['hash1.png']).toBe('image_hash1.png')
+      expect(dedupMapping['hash2.png']).toBe('image_hash2.png')
+    })
+  })
+
   describe('getMapping', () => {
     it('should fetch mappings from API', async () => {
       const mockData: FileNameMapping = {