Proto-Celtic *roudos

→ English Roy (derived)

→ English ruddock (mention)

→ Breton ruz (inherited)

→ Welsh rhudd (inherited)

→ Irish rua (inherited)

→ Scottish Gaelic ruadh (inherited)

→ Manx ruy (inherited)

→ Cornish rudh (inherited)

→ Old Irish rúad (inherited)