diff --git a/llvm/lib/Object/COFFImportFile.cpp b/llvm/lib/Object/COFFImportFile.cpp
index 8224a1492502f..477c5bf98249f 100644
--- a/llvm/lib/Object/COFFImportFile.cpp
+++ b/llvm/lib/Object/COFFImportFile.cpp
@@ -690,12 +690,12 @@ Error writeImportLibrary(StringRef ImportName, StringRef Path,
       if (ImportType == IMPORT_CODE && isArm64EC(M)) {
         if (std::optional<std::string> MangledName =
                 getArm64ECMangledFunctionName(Name)) {
-          if (ExportName.empty()) {
+          if (!E.Noname && ExportName.empty()) {
             NameType = IMPORT_NAME_EXPORTAS;
             ExportName.swap(Name);
           }
           Name = std::move(*MangledName);
-        } else if (ExportName.empty()) {
+        } else if (!E.Noname && ExportName.empty()) {
           NameType = IMPORT_NAME_EXPORTAS;
           ExportName = std::move(*getArm64ECDemangledFunctionName(Name));
         }
diff --git a/llvm/test/tools/llvm-lib/arm64ec-implib.test b/llvm/test/tools/llvm-lib/arm64ec-implib.test
index 9ce53fe0fea07..e9987d0ca2e64 100644
--- a/llvm/test/tools/llvm-lib/arm64ec-implib.test
+++ b/llvm/test/tools/llvm-lib/arm64ec-implib.test
@@ -14,6 +14,8 @@ ARMAP-NEXT: Archive EC map
 ARMAP-NEXT: #expname in test.dll
 ARMAP-NEXT: #funcexp in test.dll
 ARMAP-NEXT: #mangledfunc in test.dll
+ARMAP-NEXT: #manglednonamefunc in test.dll
+ARMAP-NEXT: #nonamefunc in test.dll
 ARMAP-NEXT: ?test_cpp_func@@$$hYAHPEAX@Z in test.dll
 ARMAP-NEXT: ?test_cpp_func@@YAHPEAX@Z in test.dll
 ARMAP-NEXT: __IMPORT_DESCRIPTOR_test in test.dll
@@ -23,13 +25,19 @@ ARMAP-NEXT: __imp_aux_?test_cpp_func@@YAHPEAX@Z in test.dll
 ARMAP-NEXT: __imp_aux_expname in test.dll
 ARMAP-NEXT: __imp_aux_funcexp in test.dll
 ARMAP-NEXT: __imp_aux_mangledfunc in test.dll
+ARMAP-NEXT: __imp_aux_manglednonamefunc in test.dll
+ARMAP-NEXT: __imp_aux_nonamefunc in test.dll
 ARMAP-NEXT: __imp_dataexp in test.dll
 ARMAP-NEXT: __imp_expname in test.dll
 ARMAP-NEXT: __imp_funcexp in test.dll
 ARMAP-NEXT: __imp_mangledfunc in test.dll
+ARMAP-NEXT: __imp_manglednonamefunc in test.dll
+ARMAP-NEXT: __imp_nonamefunc in test.dll
 ARMAP-NEXT: expname in test.dll
 ARMAP-NEXT: funcexp in test.dll
 ARMAP-NEXT: mangledfunc in test.dll
+ARMAP-NEXT: manglednonamefunc in test.dll
+ARMAP-NEXT: nonamefunc in test.dll
 ARMAP-NEXT: test_NULL_THUNK_DATA in test.dll
 
 RUN: llvm-readobj test.lib | FileCheck -check-prefix=READOBJ %s
@@ -95,6 +103,25 @@ READOBJ-NEXT: Type: data
 READOBJ-NEXT: Name type: name
 READOBJ-NEXT: Export name: dataexp
 READOBJ-NEXT: Symbol: __imp_dataexp
+READOBJ-EMPTY:
+READOBJ-NEXT: File: test.dll
+READOBJ-NEXT: Format: COFF-import-file-ARM64EC
+READOBJ-NEXT: Type: code
+READOBJ-NEXT: Name type: ordinal
+READOBJ-NEXT: Symbol: __imp_nonamefunc
+READOBJ-NEXT: Symbol: nonamefunc
+READOBJ-NEXT: Symbol: __imp_aux_nonamefunc
+READOBJ-NEXT: Symbol: #nonamefunc
+READOBJ-EMPTY:
+READOBJ-NEXT: File: test.dll
+READOBJ-NEXT: Format: COFF-import-file-ARM64EC
+READOBJ-NEXT: Type: code
+READOBJ-NEXT: Name type: ordinal
+READOBJ-NEXT: Symbol: __imp_manglednonamefunc
+READOBJ-NEXT: Symbol: manglednonamefunc
+READOBJ-NEXT: Symbol: __imp_aux_manglednonamefunc
+READOBJ-NEXT: Symbol: #manglednonamefunc
+
 
 Using -machine:arm64x gives the same output.
 RUN: llvm-lib -machine:arm64x -def:test.def -out:testx.lib
@@ -112,22 +139,28 @@ RUN: llvm-nm --print-armap testx.lib | FileCheck -check-prefix=ARMAPX %s
 
 ARMAPX:      Archive map
 ARMAPX-NEXT: #mangledfunc in test.dll
+ARMAPX-NEXT: #manglednonamefunc in test.dll
 ARMAPX-NEXT: ?test_cpp_func@@YAHPEAX@Z in test.dll
 ARMAPX-NEXT: __IMPORT_DESCRIPTOR_test in test.dll
 ARMAPX-NEXT: __NULL_IMPORT_DESCRIPTOR in test.dll
 ARMAPX-NEXT: __imp_#mangledfunc in test.dll
+ARMAPX-NEXT: __imp_#manglednonamefunc in test.dll
 ARMAPX-NEXT: __imp_?test_cpp_func@@YAHPEAX@Z in test.dll
 ARMAPX-NEXT: __imp_dataexp in test.dll
 ARMAPX-NEXT: __imp_expname in test.dll
 ARMAPX-NEXT: __imp_funcexp in test.dll
+ARMAPX-NEXT: __imp_nonamefunc in test.dll
 ARMAPX-NEXT: expname in test.dll
 ARMAPX-NEXT: funcexp in test.dll
+ARMAPX-NEXT: nonamefunc in test.dll
 ARMAPX-NEXT: test_NULL_THUNK_DATA in test.dll
 ARMAPX-EMPTY:
 ARMAPX-NEXT: Archive EC map
 ARMAPX-NEXT: #expname in test.dll
 ARMAPX-NEXT: #funcexp in test.dll
 ARMAPX-NEXT: #mangledfunc in test.dll
+ARMAPX-NEXT: #manglednonamefunc in test.dll
+ARMAPX-NEXT: #nonamefunc in test.dll
 ARMAPX-NEXT: ?test_cpp_func@@$$hYAHPEAX@Z in test.dll
 ARMAPX-NEXT: ?test_cpp_func@@YAHPEAX@Z in test.dll
 ARMAPX-NEXT: __IMPORT_DESCRIPTOR_test in test.dll
@@ -137,13 +170,19 @@ ARMAPX-NEXT: __imp_aux_?test_cpp_func@@YAHPEAX@Z in test.dll
 ARMAPX-NEXT: __imp_aux_expname in test.dll
 ARMAPX-NEXT: __imp_aux_funcexp in test.dll
 ARMAPX-NEXT: __imp_aux_mangledfunc in test.dll
+ARMAPX-NEXT: __imp_aux_manglednonamefunc in test.dll
+ARMAPX-NEXT: __imp_aux_nonamefunc in test.dll
 ARMAPX-NEXT: __imp_dataexp in test.dll
 ARMAPX-NEXT: __imp_expname in test.dll
 ARMAPX-NEXT: __imp_funcexp in test.dll
 ARMAPX-NEXT: __imp_mangledfunc in test.dll
+ARMAPX-NEXT: __imp_manglednonamefunc in test.dll
+ARMAPX-NEXT: __imp_nonamefunc in test.dll
 ARMAPX-NEXT: expname in test.dll
 ARMAPX-NEXT: funcexp in test.dll
 ARMAPX-NEXT: mangledfunc in test.dll
+ARMAPX-NEXT: manglednonamefunc in test.dll
+ARMAPX-NEXT: nonamefunc in test.dll
 ARMAPX-NEXT: test_NULL_THUNK_DATA in test.dll
 
 RUN: llvm-readobj testx.lib | FileCheck -check-prefix=READOBJX %s
@@ -211,6 +250,24 @@ READOBJX-NEXT: Export name: dataexp
 READOBJX-NEXT: Symbol: __imp_dataexp
 READOBJX-EMPTY:
 READOBJX-NEXT: File: test.dll
+READOBJX-NEXT: Format: COFF-import-file-ARM64EC
+READOBJX-NEXT: Type: code
+READOBJX-NEXT: Name type: ordinal
+READOBJX-NEXT: Symbol: __imp_nonamefunc
+READOBJX-NEXT: Symbol: nonamefunc
+READOBJX-NEXT: Symbol: __imp_aux_nonamefunc
+READOBJX-NEXT: Symbol: #nonamefunc
+READOBJX-EMPTY:
+READOBJX-NEXT: File: test.dll
+READOBJX-NEXT: Format: COFF-import-file-ARM64EC
+READOBJX-NEXT: Type: code
+READOBJX-NEXT: Name type: ordinal
+READOBJX-NEXT: Symbol: __imp_manglednonamefunc
+READOBJX-NEXT: Symbol: manglednonamefunc
+READOBJX-NEXT: Symbol: __imp_aux_manglednonamefunc
+READOBJX-NEXT: Symbol: #manglednonamefunc
+READOBJX-EMPTY:
+READOBJX-NEXT: File: test.dll
 READOBJX-NEXT: Format: COFF-import-file-ARM64
 READOBJX-NEXT: Type: code
 READOBJX-NEXT: Name type: name
@@ -248,6 +305,20 @@ READOBJX-NEXT: Type: data
 READOBJX-NEXT: Name type: name
 READOBJX-NEXT: Export name: dataexp
 READOBJX-NEXT: Symbol: __imp_dataexp
+READOBJX-EMPTY:
+READOBJX-NEXT: File: test.dll
+READOBJX-NEXT: Format: COFF-import-file-ARM64
+READOBJX-NEXT: Type: code
+READOBJX-NEXT: Name type: ordinal
+READOBJX-NEXT: Symbol: __imp_nonamefunc
+READOBJX-NEXT: Symbol: nonamefunc
+READOBJX-EMPTY:
+READOBJX-NEXT: File: test.dll
+READOBJX-NEXT: Format: COFF-import-file-ARM64
+READOBJX-NEXT: Type: code
+READOBJX-NEXT: Name type: ordinal
+READOBJX-NEXT: Symbol: __imp_#manglednonamefunc
+READOBJX-NEXT: Symbol: #manglednonamefunc
 
 
 RUN: llvm-lib -machine:arm64ec -def:test.def -defArm64Native:test2.def -out:test2.lib
@@ -266,6 +337,8 @@ ARMAPX2-NEXT: Archive EC map
 ARMAPX2-NEXT: #expname in test2.dll
 ARMAPX2-NEXT: #funcexp in test2.dll
 ARMAPX2-NEXT: #mangledfunc in test2.dll
+ARMAPX2-NEXT: #manglednonamefunc in test2.dll
+ARMAPX2-NEXT: #nonamefunc in test2.dll
 ARMAPX2-NEXT: ?test_cpp_func@@$$hYAHPEAX@Z in test2.dll
 ARMAPX2-NEXT: ?test_cpp_func@@YAHPEAX@Z in test2.dll
 ARMAPX2-NEXT: __IMPORT_DESCRIPTOR_test2 in test2.dll
@@ -275,13 +348,19 @@ ARMAPX2-NEXT: __imp_aux_?test_cpp_func@@YAHPEAX@Z in test2.dll
 ARMAPX2-NEXT: __imp_aux_expname in test2.dll
 ARMAPX2-NEXT: __imp_aux_funcexp in test2.dll
 ARMAPX2-NEXT: __imp_aux_mangledfunc in test2.dll
+ARMAPX2-NEXT: __imp_aux_manglednonamefunc in test2.dll
+ARMAPX2-NEXT: __imp_aux_nonamefunc in test2.dll
 ARMAPX2-NEXT: __imp_dataexp in test2.dll
 ARMAPX2-NEXT: __imp_expname in test2.dll
 ARMAPX2-NEXT: __imp_funcexp in test2.dll
 ARMAPX2-NEXT: __imp_mangledfunc in test2.dll
+ARMAPX2-NEXT: __imp_manglednonamefunc in test2.dll
+ARMAPX2-NEXT: __imp_nonamefunc in test2.dll
 ARMAPX2-NEXT: expname in test2.dll
 ARMAPX2-NEXT: funcexp in test2.dll
 ARMAPX2-NEXT: mangledfunc in test2.dll
+ARMAPX2-NEXT: manglednonamefunc in test2.dll
+ARMAPX2-NEXT: nonamefunc in test2.dll
 ARMAPX2-NEXT: test2_NULL_THUNK_DATA in test2.dll
 
 ARMAPX2:      test2.dll:
@@ -312,6 +391,18 @@ ARMAPX2-NEXT: test2.dll:
 ARMAPX2-NEXT: 00000000 D __imp_dataexp
 ARMAPX2-EMPTY:
 ARMAPX2-NEXT: test2.dll:
+ARMAPX2-NEXT: 00000000 T #nonamefunc
+ARMAPX2-NEXT: 00000000 T __imp_aux_nonamefunc
+ARMAPX2-NEXT: 00000000 T __imp_nonamefunc
+ARMAPX2-NEXT: 00000000 T nonamefunc
+ARMAPX2-EMPTY:
+ARMAPX2-NEXT: test2.dll:
+ARMAPX2-NEXT: 00000000 T #manglednonamefunc
+ARMAPX2-NEXT: 00000000 T __imp_aux_manglednonamefunc
+ARMAPX2-NEXT: 00000000 T __imp_manglednonamefunc
+ARMAPX2-NEXT: 00000000 T manglednonamefunc
+ARMAPX2-EMPTY:
+ARMAPX2-NEXT: test2.dll:
 ARMAPX2-NEXT: 00000000 T __imp_otherfunc
 ARMAPX2-NEXT: 00000000 T otherfunc
 
@@ -406,6 +497,8 @@ EXPORTS
     ?test_cpp_func@@YAHPEAX@Z
     expname=impname
     dataexp DATA
+    nonamefunc @1 NONAME
+    #manglednonamefunc @2 NONAME
 
 #--- test2.def
 LIBRARY test2.dll