Welsh Iau

← Breton Yaou (cognate)

← Proto-Indo-European *dyew- (derived)

← Cornish de Yow (cognate)

← Latin Iovem (borrowed)

← Latin Iuppiter (mention)

→ Breton Yaou (cognate)

→ Welsh dydd Iau (affix)

→ Welsh nos Iau (compound)