gwerthfawr (Welsh) comes from Welsh mawr, from Middle Welsh mawr, from Old Welsh maur, from Proto-Brythonic mọr, from Proto-Celtic mori, from Proto-Indo-European móri, from Proto-Indo-European mer- — to die; to disappear; sea, lake, wetland.
gwerthfawr (Welsh): valuable, precious
Definitions
valuable, precious
Ancestry of “gwerthfawr”, step by step
gwerthfawr traces back through two separate lines of ancestry.