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Surname Siyahul (Siyahul ) , globally, is an extremely rare cognomen. Much more frequently, Siyahul is the forename as well as the last name.
Сиягул, and Сиягуль
Hak, Haq, Hakk, Hakh, Huck, Akbar, Haque, Siyath, Rahman, Rehman, and Pukkatt