I see why you might think she looks like a cookie. I think her name in English was changed to maybe sound like coconut?
but her original name, in Japanese, is Yayoi - which is the historical period associated with haniwa, a type of Japanese funerary sculpture which both Coco and the gyroids are based on (in Japanese I think the gyroids are also just called haniwa)
i don’t want you to sound like I am trying to make you feel bad for your alternate theory, or ruin it or anything. I am just a nerd and I think the Japanese cultural elements in the game are really fun. Clay is actually also based on ancient Japanese statuary, the doguu, which is from the Jomon period.
as for overrated villagers, I think pretty much all the very popular villagers could be considered overrated from an objective standpoint - popularity is a fickle and flimsy thing, there are literally hundreds of great villagers, and none of them are rare or objectively ‘better ‘ than any others (even if, of course, personally I feel differently)
But there’s nothing wrong with liking any villager, underrated or overrated or anything in between though. If you like them you like them!