Cognomen Уйко (Uiko 
, Уйко 
) , around the world, is a rare last name. The cognomen Уйко is habitual in Malaysia, where it is a rare surname, Kazakhstan, and Russia, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Malaysia, Kazakhstan, and India. Likewise, Уйко is the forename as well as the last name.