Where does “roy” come from?

roy (Middle English) comes from Old French roi, from Latin rēx, from Proto-Italic rēks, from Proto-Indo-European h₃rḗǵs, from Proto-Indo-European h₃reǵ- — to straighten, to right oneself; right; just.

Ancestry of “roy”, step by step

StepLanguageWordMeaning
1Old Frenchroiking
2Latinrēxking, ruler
3Proto-Italicrēksking
4Proto-Indo-Europeanh₃rḗǵsking, ruler
5Proto-Indo-Europeanh₃reǵ-to straighten, to right oneself; right; just

Words derived from “roy

Every word from Proto-Indo-European h₃reǵ-