Where does “Gwenllian” come from?

Gwenllian (English) comes from Welsh Gwenllian, from Proto-Celtic windos, from Proto-Indo-European windo-, from Proto-Indo-European weyd- — to see.

Ancestry of “Gwenllian”, step by step

StepLanguageWordMeaning
1WelshGwenllian—
2Proto-Celticwindoswhite
3Proto-Indo-Europeanwindo-—
4Proto-Indo-Europeanweyd-to see
Every word from Proto-Indo-European weyd- →Every word from Proto-Indo-European windo- →Every word from Proto-Celtic windos →