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Japan does like shoving the concept/imagery of the Yggdrasil Tree into almost any game or anime that's fantasy related. There was also that Vinland Saga anime that came out a few years ago... Maybe Toei thinks they can strike a profit by digging deeper and trying something else connected to Norse mythology?

My next guess is it's another portmanteau, or maybe even an anagram of something? Gates (no wait, they did that already)? Stage? Getas?

Honestly I'm sorta impressed by the name because outside of the literal definition, I'm completely lost on what this could be. All I know for sure at this point is that when the design gets officially revealed, my response is going to be "Yep, he definitely looks like a Geats."