Proto-Celtic *māros

→ Breton meur (inherited)

→ Gaulish Iantumaros (derived)

→ Gaulish Segomaros (derived)

→ Welsh hwy (mention)

→ Welsh mawr (inherited)

→ Welsh mwy (mention)

→ Irish mór (inherited)

→ Irish mó (mention)

→ Scottish Gaelic mò (mention)

→ Scottish Gaelic mòr (inherited)

→ Galician marulán (derived)

→ Manx moo (mention)

→ Italian marrone (derived)

→ Cornish meur (inherited)

→ Latin Maroboduus (derived)

→ Old Welsh maur (inherited)

→ Old Irish mór (inherited)