Where does “rei” come from?

rei (Old Catalan) comes 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 “rei”, step by step

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

Words derived from “rei”

Every word from Proto-Indo-European h₃reǵ- →Every word from Proto-Indo-European h₃rḗǵs →Every word from Proto-Italic rēks →
rei — Etymology, Origin & Word History | Etymology Explorer