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Cognomen Сільван (Сільван ) , in all the world, is an extremely rare surname. Much more prevalently, Сільван is the forename as well as the last name.
Silvan, and Silvano
Дуда, Іліуц, Сизюк, Труфін, Митрик, Герман, Лонгшам, and Вербовський