Old Irish cailech

← Proto-Celtic *kalyākos (inherited)

← Proto-Indo-European *kelh₁- (root)

← Proto-Indo-European *kelh₁- (derived)

→ Irish coileach (inherited)

→ Scottish Gaelic coileach (inherited)

→ Ancient Greek καλέω (cognate)

→ Manx kellagh (inherited)

→ Old Armenian աքաղաղ (cognate)