Welsh duw

← Proto-Brythonic *duɨw (inherited)

← Proto-Celtic *dēwos (inherited)

← Proto-Indo-European *dyew- (root)

← Proto-Indo-European *deywós (inherited)

→ Welsh Duw (mention)

→ Welsh duwies (affix)

→ Irish dia (cognate)

→ Scottish Gaelic dia (cognate)

→ Latin deus (cognate)

→ Old Irish día (cognate)