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It's a big one eh? :D Actually, I've never heard of the word Drys as an Indo-European guy (I'm an Indo), where did you hear this?

Protoindoeuropean is an extinct language is estimated to have existed 4,500 B.C.E. to 2,500 B.C.E, but actually is the root of many European languages. Same roots if we both go back enough in time

Drys (oak) would be used by the greek too thus spirits of trees called dryads
And the world tree derived from it

Here me with my fav oak

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