Proto-Celtic *tīros

→ English Tyrol (derived)

→ Breton tir (inherited)

→ Welsh tir (inherited)

→ Irish tír (inherited)

→ Scottish Gaelic tìr (inherited)

→ Manx çheer (inherited)

→ Cornish tir (inherited)

→ Norman Tithol (derived)

→ Old Welsh tir (inherited)

→ Old Irish tír (inherited)