Old Irish rúad

← Old English rēad (cognate)

← Proto-Celtic *roudos (inherited)

← Welsh rhudd (cognate)

← Ancient Greek ἐρυθρός (cognate)

← Proto-Indo-European *h₁rewdʰ- (derived)

← Sanskrit रुधिर (cognate)

→ English Roy (derived)

→ English rud (cognate)

→ Old English read (cognate)

→ Old English reod (cognate)

→ Irish rua (inherited)

→ Scottish Gaelic ruadh (inherited)

→ Manx ruy (inherited)

→ Old Irish Rúadán (affix)