Where does “Arianwen” come from?

Arianwen (Welsh) comes from Welsh arian, from Middle Welsh ariant, from Proto-Brythonic arɣant, from Proto-Celtic argantom, from Proto-Indo-European h₂r̥ǵn̥tóm, from Proto-Indo-European h₂erǵ- — white, argent; glittering.

Ancestry of “Arianwen”, step by step

Arianwen traces back through two separate lines of ancestry.

via Welsh arian

StepLanguageWordMeaning
1Welshariansilver, argent; money; silver, silvern
2Middle Welshariantsilver
3Proto-Brythonicarɣantsilver, money
4Proto-Celticargantomsilver
5Proto-Indo-Europeanh₂r̥ǵn̥tómsilver
6Proto-Indo-Europeanh₂erǵ-white, argent; glittering

via Welsh gwên

StepLanguageWordMeaning
1Welshgwênsmile
2Proto-Celticwindoswhite
3Proto-Indo-Europeanwindo-—
4Proto-Indo-Europeanweyd-to see
Every word from Proto-Indo-European h₂erǵ- →Every word from Proto-Indo-European h₂r̥ǵn̥tóm →Every word from Proto-Celtic argantom →