Proto-Celtic *tarwos

→ Breton tarv (inherited)

→ Gaulish taruos (inherited)

→ Welsh tarw (inherited)

→ Faroese tarvur (derived)

→ Irish tarbh (inherited)

→ Scottish Gaelic tarbh (inherited)

→ Manx tarroo (inherited)

→ Icelandic tarfur (derived)

→ Cornish tarow (inherited)

→ Latin Taurini (cognate)

→ Old Norse tarfr (derived)

→ Old Irish tarb (inherited)