Irish ár

← Proto-Celtic *anserom (inherited)

← Proto-Celtic *agros (inherited)

← German unser (cognate)

← French are (borrowed)

← Ancient Greek ἄγρα (cognate)

← Proto-Indo-European *n̥serōm (inherited)

← Proto-Indo-European *nos (mention)

← Proto-Indo-European *h₂eǵ- (root)

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

← Latin area (derived)

← Old Irish ar (inherited)

← Old Irish ár (inherited)

→ Irish mucár (affix)

→ Irish arnár (mention)

→ Scottish Gaelic ar (cognate)