Where does “Gjertrud” come from?

Gjertrud (Norwegian Nynorsk) comes from Old Norse Geirþrúðr, from Old Norse geirr, from Proto-Germanic gaizaz, from Proto-Indo-European ǵʰoysós, from Proto-Indo-European ǵʰey- — winter.

Ancestry of “Gjertrud”, step by step

StepLanguageWordMeaning
1Old NorseGeirþrúðr—
2Old Norsegeirrspear
3Proto-Germanicgaizazspear, pike, javelin
4Proto-Indo-Europeanǵʰoysósthrowing spear
5Proto-Indo-Europeanǵʰey-winter
Every word from Proto-Indo-European ǵʰey- →Every word from Proto-Indo-European ǵʰoysós →Every word from Proto-Germanic gaizaz →