Welsh beidr

← Proto-Brythonic *beudr (inherited)

← Proto-Celtic *bowitros (inherited)

← Proto-Celtic *bāus (mention)

← Proto-Celtic *itos (mention)

← Ancient Greek βαίνω (cognate)

← Proto-Indo-European *h₁itós (derived)

← Proto-Indo-European *gʷem- (mention)

→ Welsh feidr (link)

→ Irish bóthar (cognate)