Eternals, the movie that doesn't end

[Psyren]

Based on what we see, I don't think so.

Spoiler: spoiler

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Or at least, their forms are given to them by Arishem as best I could tell. He may have chosen randomly. I assume (though the bit with a bunch of half-constructed Circe's pushes against this) that eternals on other worlds look like the local inhabitants, so just picking a random set of local appearances would be reasonable.

To be fair, a ton of other Marvel aliens look pretty human too - Asgardians, Shi'ar, Kree, D'bari, whatever Gamora's people and the Collector's people and the Grandmaster's people are etc. Sure some of them get shades/tints that we don't get but the structure is still there.

Yeah, but the idea of Celestials being born from planets doesn't.

Looking it up, it seems that it originally comes from the Earth-X books in the 90s and was then brought into the main marvel universe in the early 2010s, about the same time the idea started being explored in WoW.

The Earth-X books were still Marvel, just not 616. So still a roughly decade leg up on WoW.