Where does “Rhian” come from?

Rhian (English) comes from Welsh Rhian, from Welsh rhiain, from Middle Welsh riein, from Proto-Brythonic rriɣėn, from Proto-Celtic rīganī, from Proto-Indo-European h₃rḗǵnih₂, from Proto-Indo-European h₃rḗǵs, from Proto-Indo-European h₃reǵ- — to straighten, to right oneself; right; just.

Ancestry of “Rhian”, step by step

StepLanguageWordMeaning
1WelshRhian—
2Welshrhiainmaiden
3Middle Welshriein—
4Proto-Brythonicrriɣėnqueen
5Proto-Celticrīganīqueen
6Proto-Indo-Europeanh₃rḗǵnih₂queen
7Proto-Indo-Europeanh₃rḗǵsking, ruler
8Proto-Indo-Europeanh₃reǵ-to straighten, to right oneself; right; just
Every word from Proto-Indo-European h₃reǵ- →Every word from Proto-Indo-European h₃rḗǵs →Every word from Proto-Indo-European h₃rḗǵnih₂ →