Where does “greylag” come from?

greylag (English) comes from English Grey, from Middle English grey, from Old English grǣġ, from Proto-West Germanic *grāu, from Proto-Germanic grēwaz, from Proto-Indo-European ǵʰreh₁- — to become green, grow; to grow; to green, to grow.

greylag (English): A large grey European goose, "Anser anser", with...

Definitions

  1. A large grey European goose, "Anser anser", with...

Ancestry of “greylag”, step by step

greylag traces back through two separate lines of ancestry.

via English Grey

StepLanguageWordMeaning
1EnglishGreyA member of the Royal Scots Greys, a cavalry...
2Middle Englishgreygrey, dull, drab; glinting, glistening; grey
3Old Englishgrǣġ
4Proto-West Germanic*grāugrey
5Proto-Germanicgrēwazgrey
6Proto-Indo-Europeanǵʰreh₁-to become green, grow; to grow; to green, to grow

via English LAG

StepLanguageWordMeaning
1EnglishLAGLoose and aggressive
Every word from Proto-Indo-European ǵʰreh₁-Every word from Proto-Germanic grēwazEvery word from Proto-West Germanic *grāu