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Surname Кощаев (Кощаев ) , globally, is a very rare family name. The last name Кощаев is characteristic of Kyrgyzstan, where it is a very rare surname, Kazakhstan, and Russia.
Koshaev, and Koshayev
Юрий, Денис, Кирилл, Андрей, Виктор, Сергей, Владимир, and Александр