Where does “iwina” come from?

iwina (Polish) comes from Polish iwa, from Polish Iwona, from French Yvonne, from French Yves, from Proto-Celtic īwos, from Proto-Indo-European *h₁eyHw- — yew.

Ancestry of “iwina”, step by step

StepLanguageWordMeaning
1Polishiwagoat willow
2PolishIwona—
3FrenchYvonne—
4FrenchYvesborne by two French saints, and known in medieval romance
5Proto-Celticīwosyew
6Proto-Indo-European*h₁eyHw-yew
Every word from Proto-Indo-European *h₁eyHw- →Every word from Proto-Celtic īwos →Every word from French Yves →