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Cognomen Ilar (Ilar , Hilaris , Hilare ) , around the globe, is quite a rare surname. The cognomen Ilar is characteristic of Slovenia, where it is quite a rare surname, Philippines, and Sweden, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Philippines, Slovenia, and the United States. Very seldom, Ilar is the forename as well as the last name.