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Cognomen Ustian (Устян , Ustian , Устиан ) , all around the world, is quite a rare last name. The last name Ustian is characteristic of Georgia, where it is quite a rare surname, Russia, and Armenia, where it is a rare surname. In absolute terms, this name is the most popular in Russia, Georgia, and Ukraine. Much less frequently, Ustian is the forename as well as the last name.