Where does “Giel” come from?

Giel (Polish) comes from Polish Gil, from Proto-Slavic gylь — bullfinch.

Ancestry of “Giel”, step by step

StepLanguageWordMeaning
1PolishGilbullfinch
2Proto-Slavicgylьbullfinch
Every word from Proto-Slavic gylьEvery word from Polish Gil