diff --git a/src/fesa/io/abaqus/domain_mapper.cpp b/src/fesa/io/abaqus/domain_mapper.cpp
index c7b0c63..c6aa07d 100644
--- a/src/fesa/io/abaqus/domain_mapper.cpp
+++ b/src/fesa/io/abaqus/domain_mapper.cpp
@@ -398,20 +398,23 @@ private:
             });
     }
 
-    bool containsSetName(const RawPart& part, const std::string& name) const {
+    bool containsSetName(
+        const std::vector<RawSet>& sets,
+        const std::string& name) const {
         const auto matches = [&name](const RawSet& set) {
             return equalName(set.name, name);
         };
-        return std::any_of(part.nodeSets.begin(), part.nodeSets.end(), matches) ||
-               std::any_of(part.elementSets.begin(), part.elementSets.end(), matches);
+        return std::any_of(sets.begin(), sets.end(), matches);
     }
 
-    bool containsAssemblySetName(const std::string& name) const {
+    bool containsAssemblySetName(
+        bool nodeSet,
+        const std::string& name) const {
         return std::any_of(
             assemblySets_.begin(),
             assemblySets_.end(),
-            [&name](const RawAssemblySet& set) {
-                return equalName(set.name, name);
+            [nodeSet, &name](const RawAssemblySet& set) {
+                return set.isNodeSet == nodeSet && equalName(set.name, name);
             });
     }
 
@@ -1025,10 +1028,12 @@ private:
                 "GENERATE is a valueless flag.");
             return;
         }
-        if (containsSetName(part, *name)) {
+        const auto& sets = nodeSet ? part.nodeSets : part.elementSets;
+        if (containsSetName(sets, *name)) {
             inputFailure(
                 "duplicate-entity", block.location, block.canonicalName,
-                *name, "Set names are unique within a part.");
+                *name,
+                "Set names are unique within their node-set or element-set namespace.");
             return;
         }
         RawSet set{*name, {}, block.location};
@@ -1295,10 +1300,11 @@ private:
                 "GENERATE is a valueless flag.");
             return;
         }
-        if (containsAssemblySetName(*name)) {
+        if (containsAssemblySetName(nodeSet, *name)) {
             inputFailure(
                 "duplicate-entity", block.location, block.canonicalName,
-                *name, "Assembly set names are unique.");
+                *name,
+                "Assembly set names are unique within their node-set or element-set namespace.");
             return;
         }
         RawAssemblySet set{nodeSet, *name, *instance, {}, block.location};
@@ -2275,6 +2281,14 @@ private:
                 return;
             }
             if (rawSet.isNodeSet) {
+                definition_.nodeSets.erase(
+                    std::remove_if(
+                        definition_.nodeSets.begin(),
+                        definition_.nodeSets.end(),
+                        [&rawSet](const NodeSet& set) {
+                            return equalName(set.name, rawSet.name);
+                        }),
+                    definition_.nodeSets.end());
                 NodeSet set{
                     rawSet.name, definitionInstance->name, {}, rawSet.location};
                 for (const auto member : rawSet.members) {
@@ -2295,6 +2309,14 @@ private:
                 }
                 definition_.nodeSets.push_back(std::move(set));
             } else {
+                definition_.elementSets.erase(
+                    std::remove_if(
+                        definition_.elementSets.begin(),
+                        definition_.elementSets.end(),
+                        [&rawSet](const ElementSet& set) {
+                            return equalName(set.name, rawSet.name);
+                        }),
+                    definition_.elementSets.end());
                 ElementSet set{
                     rawSet.name, definitionInstance->name, {}, rawSet.location};
                 for (const auto member : rawSet.members) {
diff --git a/tests/unit/io/abaqus/domain_mapper_test.cpp b/tests/unit/io/abaqus/domain_mapper_test.cpp
index e1d90cd..e8e54f7 100644
--- a/tests/unit/io/abaqus/domain_mapper_test.cpp
+++ b/tests/unit/io/abaqus/domain_mapper_test.cpp
@@ -436,6 +436,69 @@ OnlySecond, 2, 5.
     ASSERT_TRUE(largeFinite.hasValue());
 }
 
+TEST(InpDomainMapping, KeepsNodeAndElementSetNamesInSeparateNamespaces) {
+    auto sharedName = mapText(
+        "separate-part-set-namespaces",
+        replaceOnce(
+            shellDeck(),
+            "*Elset, elset=ShellS4\n10",
+            "*Nset, nset=ShellS4\n1, 2, 3, 4\n*Elset, elset=ShellS4\n10"));
+
+    ASSERT_TRUE(sharedName.hasValue());
+    const auto& domain = sharedName.value();
+    EXPECT_TRUE(std::any_of(
+        domain.nodeSets().begin(), domain.nodeSets().end(),
+        [](const fesa::NodeSet& set) { return set.name == "ShellS4"; }));
+    EXPECT_TRUE(std::any_of(
+        domain.elementSets().begin(), domain.elementSets().end(),
+        [](const fesa::ElementSet& set) { return set.name == "ShellS4"; }));
+
+    auto duplicateNodeSet = mapText(
+        "duplicate-part-node-set",
+        replaceOnce(
+            shellDeck(),
+            "*Elset, elset=ShellS4\n10",
+            "*Nset, nset=Shared\n1\n*Nset, nset=Shared\n2\n"
+            "*Elset, elset=ShellS4\n10"));
+    ASSERT_FALSE(duplicateNodeSet.hasValue());
+    EXPECT_NE(findDiagnostic(duplicateNodeSet.status(), "duplicate-entity"), nullptr);
+
+    auto duplicateElementSet = mapText(
+        "duplicate-part-element-set",
+        replaceOnce(
+            shellDeck(),
+            "*Elset, elset=ShellS4\n10",
+            "*Elset, elset=Repeated\n10\n*Elset, elset=Repeated\n20\n"
+            "*Elset, elset=ShellS4\n10"));
+    ASSERT_FALSE(duplicateElementSet.hasValue());
+    EXPECT_NE(findDiagnostic(duplicateElementSet.status(), "duplicate-entity"), nullptr);
+
+    auto assemblySharedName = mapText(
+        "separate-assembly-set-namespaces",
+        replaceOnce(
+            replaceOnce(
+                minimalDeck(),
+                "*Elset, elset=BeamSet\n1",
+                "*Nset, nset=Root\n1, 2\n*Elset, elset=BeamSet\n1"),
+            "*Nset, nset=Root, instance=Beam-1\n1",
+            "*Nset, nset=Root, instance=Beam-1\n1\n"
+            "*Elset, elset=Root, instance=Beam-1\n1"));
+    ASSERT_TRUE(assemblySharedName.hasValue());
+    const auto& assemblyDomain = assemblySharedName.value();
+    const auto rootNodeSetCount = std::count_if(
+        assemblyDomain.nodeSets().begin(), assemblyDomain.nodeSets().end(),
+        [](const fesa::NodeSet& set) { return set.name == "Root"; });
+    EXPECT_EQ(rootNodeSetCount, 1);
+    const auto rootNodeSet = std::find_if(
+        assemblyDomain.nodeSets().begin(), assemblyDomain.nodeSets().end(),
+        [](const fesa::NodeSet& set) { return set.name == "Root"; });
+    ASSERT_NE(rootNodeSet, assemblyDomain.nodeSets().end());
+    EXPECT_EQ(rootNodeSet->nodeIndices, (std::vector<fesa::EntityIndex>{0U}));
+    EXPECT_EQ(std::count_if(
+        assemblyDomain.elementSets().begin(), assemblyDomain.elementSets().end(),
+        [](const fesa::ElementSet& set) { return set.name == "Root"; }), 1);
+}
+
 TEST(InpDomainMapping, NoOpAllowlistWarnsWithoutSemanticEffect) {
     auto plain = mapText("without-no-ops", supportedInventoryDeck(false));
     auto withNoOps = mapText("with-no-ops", supportedInventoryDeck(true));