>>32518328Golduck's name in Japan is Gorudak, and the "gold" part was a result of how the name was romanized.
Gorudak has nothing to do with color. It takes Psyduck's Japanese name and incorporates "garuda" in it.
This is why Golduck doesn't have a bowl in its head, even though it's based on a kappa. The spikes it has instead show that Golduck is also based on a garuda.