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Last name Kolar (Kolar , كولار , Kolář ) , in all the world, is a common cognomen. The family name Kolar is characteristic of Slovenia, where it is a common surname, Czechia, and Croatia, where it is quite a common surname (explore the name in all countries). In absolute terms, it is the most numerous in Czechia, India, and the United States. Much less frequently, Kolar is the forename as well as the last name.