Welsh yw

← Proto-Celtic *iwos (inherited)

← Welsh ydy (link)

← English yew (link)

← Proto-Indo-European *h₁eyHweh₂ (inherited)

→ English yew (cognate)

→ Breton ivin (cognate)

→ Welsh y (link)

→ Welsh meryw (compound)

→ Irish eo (cognate)

→ Irish Í (cognate)