Old Irish ár

← Avestan 𐬀𐬰𐬭𐬋𐬛𐬀𐬌𐬜𐬍 (cognate)

← Proto-Celtic *agrom (inherited)

← Ancient Greek ἄγρα (cognate)

← Proto-Indo-European *h₂eǵ- (root)

← Proto-Indo-European *h₂eǵro- (inherited)

→ Irish ár (inherited)

→ Scottish Gaelic àr (inherited)

→ Manx haar (inherited)

→ Old Irish árchú (affix)

→ Old Irish ármag (affix)