diff --git a/protos_generator/gen_accessors.cc b/protos_generator/gen_accessors.cc
index 8f498439e5..7402e3afd8 100644
--- a/protos_generator/gen_accessors.cc
+++ b/protos_generator/gen_accessors.cc
@@ -735,16 +735,21 @@ std::string ResolveFieldName(const protobuf::FieldDescriptor* field,
           "arena_",
       });
 
-  static constexpr absl::string_view kClearAccessor = "clear_";
-  static constexpr absl::string_view kSetAccessor = "set_";
+  // C++ specific prefixes used by code generator for field access.
+  static constexpr absl::string_view kClearMethodPrefix = "clear_";
+  static constexpr absl::string_view kSetMethodPrefix = "set_";
+  static constexpr absl::string_view kHasMethodPrefix = "has_";
+  static constexpr absl::string_view kDeleteMethodPrefix = "delete_";
+  static constexpr absl::string_view kAddToRepeatedMethodPrefix = "add_";
+  static constexpr absl::string_view kResizeArrayMethodPrefix = "resize_";
 
   // List of generated accessor prefixes to check against.
   // Example:
   //     optional repeated string phase = 236;
   //     optional bool clear_phase = 237;
   static constexpr absl::string_view kAccessorPrefixes[] = {
-      kClearAccessor, "delete_", "add_", "resize_", kSetAccessor,
-  };
+      kClearMethodPrefix,       kDeleteMethodPrefix, kAddToRepeatedMethodPrefix,
+      kResizeArrayMethodPrefix, kSetMethodPrefix,    kHasMethodPrefix};
 
   absl::string_view field_name = field->name();
   if (kReservedNames.count(field_name) > 0) {
@@ -765,8 +770,8 @@ std::string ResolveFieldName(const protobuf::FieldDescriptor* field,
         if (candidate->is_repeated() || candidate->is_map() ||
             (candidate->cpp_type() ==
                  protobuf::FieldDescriptor::CPPTYPE_STRING &&
-             prefix == kClearAccessor) ||
-            prefix == kSetAccessor) {
+             prefix == kClearMethodPrefix) ||
+            prefix == kSetMethodPrefix || prefix == kHasMethodPrefix) {
           return absl::StrCat(field_name, "_");
         }
       }
diff --git a/protos_generator/tests/BUILD b/protos_generator/tests/BUILD
index 1ea227ca47..a854eaca72 100644
--- a/protos_generator/tests/BUILD
+++ b/protos_generator/tests/BUILD
@@ -59,6 +59,13 @@ proto_library(
     ],
 )
 
+proto_library(
+    name = "naming_conflict_proto",
+    srcs = [
+        "naming_conflict.proto",
+    ],
+)
+
 proto_library(
     name = "no_package_enum_user_proto",
     srcs = [
@@ -81,6 +88,12 @@ upb_cc_proto_library(
     deps = [":test_model_proto"],
 )
 
+upb_cc_proto_library(
+    name = "naming_conflict_upb_cc_proto",
+    visibility = ["//protos:__pkg__"],
+    deps = [":naming_conflict_proto"],
+)
+
 upb_cc_proto_library(
     name = "no_package_upb_cc_proto",
     deps = [
@@ -128,6 +141,7 @@ cc_test(
         ":no_package_upb_cc_proto",
         ":test_model_upb_cc_proto",
         ":test_model_upb_proto",
+        ":naming_conflict_upb_cc_proto",
         "@com_google_googletest//:gtest_main",
         "//:upb",
         "//protos",
diff --git a/protos_generator/tests/naming_conflict.proto b/protos_generator/tests/naming_conflict.proto
new file mode 100644
index 0000000000..35c57e3cb8
--- /dev/null
+++ b/protos_generator/tests/naming_conflict.proto
@@ -0,0 +1,8 @@
+syntax = "proto3";
+
+package protos_generator.test;
+
+message HasChildCount {
+  optional HasChildCount has_child_count = 1;
+  optional int32 child_count = 2;
+}
diff --git a/upbc/names.cc b/upbc/names.cc
index 6a74c05784..21a5766b31 100644
--- a/upbc/names.cc
+++ b/upbc/names.cc
@@ -37,16 +37,21 @@ namespace upbc {
 
 namespace protobuf = ::google::protobuf;
 
-static constexpr absl::string_view kClearAccessor = "clear_";
-static constexpr absl::string_view kSetAccessor = "set_";
+// Prefixes used by C code generator for field access.
+static constexpr absl::string_view kClearMethodPrefix = "clear_";
+static constexpr absl::string_view kSetMethodPrefix = "set_";
+static constexpr absl::string_view kHasMethodPrefix = "has_";
+static constexpr absl::string_view kDeleteMethodPrefix = "delete_";
+static constexpr absl::string_view kAddToRepeatedMethodPrefix = "add_";
+static constexpr absl::string_view kResizeArrayMethodPrefix = "resize_";
 
 // List of generated accessor prefixes to check against.
 // Example:
 //     optional repeated string phase = 236;
 //     optional bool clear_phase = 237;
 static constexpr absl::string_view kAccessorPrefixes[] = {
-    kClearAccessor, "delete_", "add_", "resize_", kSetAccessor,
-};
+    kClearMethodPrefix,       kDeleteMethodPrefix, kAddToRepeatedMethodPrefix,
+    kResizeArrayMethodPrefix, kSetMethodPrefix,    kHasMethodPrefix};
 
 std::string ResolveFieldName(const protobuf::FieldDescriptor* field,
                              const NameToFieldDescriptorMap& field_names) {
@@ -62,8 +67,8 @@ std::string ResolveFieldName(const protobuf::FieldDescriptor* field,
         if (candidate->is_repeated() || candidate->is_map() ||
             (candidate->cpp_type() ==
                  protobuf::FieldDescriptor::CPPTYPE_STRING &&
-             prefix == kClearAccessor) ||
-            prefix == kSetAccessor) {
+             prefix == kClearMethodPrefix) ||
+            prefix == kSetMethodPrefix || prefix == kHasMethodPrefix) {
           return absl::StrCat(field_name, "_");
         }
       }
@@ -105,8 +110,8 @@ std::string ResolveFieldName(upb::FieldDefPtr field,
         const auto candidate = match->second;
         if (candidate.IsSequence() || candidate.IsMap() ||
             (candidate.ctype() == kUpb_CType_String &&
-             prefix == kClearAccessor) ||
-            prefix == kSetAccessor) {
+             prefix == kClearMethodPrefix) ||
+            prefix == kSetMethodPrefix || prefix == kHasMethodPrefix) {
           return absl::StrCat(field_name, "_");
         }
       }