Welsh rhaw

← Proto-Brythonic *rrọβ (inherited)

← Proto-Celtic *rāmiyos (inherited)

← Proto-Indo-European *h₁reh₁- (root)

← Proto-Indo-European *h₁reh₁- (derived)

← Cornish rêv (cognate)

← Old Irish rámae (cognate)

← Middle Welsh raw (inherited)

← Middle Breton reuf (cognate)

→ Welsh rhofio (suffix)

→ Irish rámh (cognate)

→ Scottish Gaelic ràmh (cognate)

→ Old Irish rámae (cognate)