Where does “Rogier” come from?

Rogier (Dutch) comes from Middle Dutch Rogier, from Old French Rogier, from Latin rogerius, from Frankish Hrōthigeir, from Proto-Germanic Hrōþigaizaz, from Proto-Germanic gaizaz, from Proto-Indo-European ǵʰoysós, from Proto-Indo-European ǵʰey- — winter.

Ancestry of “Rogier”, step by step

StepLanguageWordMeaning
1Middle DutchRogier
2Old FrenchRogierfrom Old Frankish
3Latinrogerius
4FrankishHrōthigeir
5Proto-GermanicHrōþigaizazfame-spear
6Proto-Germanicgaizazspear, pike, javelin
7Proto-Indo-Europeanǵʰoysósthrowing spear
8Proto-Indo-Europeanǵʰey-winter
Every word from Proto-Indo-European ǵʰey-Every word from Proto-Indo-European ǵʰoysósEvery word from Proto-Germanic gaizaz