CC Advertising : Buick Superbird • Wait, who?

This ad ran in Spring-Summer 1965, about 3½ years before the Plymouth Superbird’s name was surely finalised. Pure chance, nudged a little by the limited number of possible [superlative] + [animal] Mad Lib car names…? (Wildcat, Superbird, Hyperferret, etc)

Or could there’ve been a Looks like GM didn’t trademark it, so »yoink!« moment?