Scottish Gaelic tagh

← Proto-Celtic *toguso- (inherited)

← Irish togh (cognate)

← Proto-Indo-European *ǵews- (root)

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

← Middle Irish togaid (inherited)

← Old Irish do·goa (inherited)

→ Irish togh (cognate)

→ Scottish Gaelic ath-thagh (prefix)