The file src/java.base/macosx/native/launcher/Info-privileged.plist, which is used when building signed macos launcher binaries, contains this snippet:

        <key>CFBundleName</key>
        <string>OpenJDK 7 Command</string>

I assume this has not been updated since JDK 7. I suggest removing the version number from the file completely, i.e.
diff --git a/src/java.base/macosx/native/launcher/Info-privileged.plist b/src/java.base/macosx/native/launcher/Info-privileged.plist
--- a/src/java.base/macosx/native/launcher/Info-privileged.plist
+++ b/src/java.base/macosx/native/launcher/Info-privileged.plist
@@ -7,7 +7,7 @@
         <key>CFBundleInfoDictionaryVersion</key>
         <string>6.0</string>
         <key>CFBundleName</key>
- <string>OpenJDK 7 Command</string>
+ <string>OpenJDK Command</string>
         <key>CFBundleShortVersionString</key>
         <string>1.0</string>
         <key>CFBundleVersion</key>