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Cognomen Haykui (Haykui ) , all around the world, is an extremely rare surname. Much more frequently, Haykui is the forename as well as the last name.
Хайкуи, and Хаыкуи
Benyan, Minasyan, Asatryan, Bakalian, Bogachachyan, Kasabyan, Poladyan, Movsisyan, and Berberian