Where does “Gertrude” come from?

Gertrude (Old French) comes from Proto-Germanic gaizaz, from Proto-Indo-European ǵʰoysós, from Proto-Indo-European ǵʰey- — winter.

Ancestry of “Gertrude”, step by step

StepLanguageWordMeaning
1Proto-Germanicgaizazspear, pike, javelin
2Proto-Indo-Europeanǵʰoysósthrowing spear
3Proto-Indo-Europeanǵʰey-winter
Every word from Proto-Indo-European ǵʰey- →Every word from Proto-Indo-European ǵʰoysós →Every word from Proto-Germanic gaizaz →