Proto-Celtic *bāus

→ English Bavaria (derived)

→ English Bohemia (derived)

→ Breton buoc'h (mention)

→ Welsh buwch (mention)

→ Welsh beidr (mention)

→ Welsh beudy (mention)

→ Irish bóthar (mention)

→ Irish bó (inherited)

→ Scottish Gaelic bò (inherited)

→ Galician busto (derived)

→ Manx booa (inherited)

→ Cornish bugh (mention)

→ Latin Boii (derived)

→ Latin Boihaemum (derived)

→ Old Irish bó (inherited)