Cognomen 'Omar (Омар 
, 'Omar) , in the world, is quite a rare last name. The cognomen 'Omar is habitual in Kazakhstan, where it is quite a rare surname, Kyrgyzstan, and Belarus, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Kazakhstan, Kyrgyzstan, and Russia. More frequently, 'Omar is the forename as well as the last name.