Cognomen Uiko (Uiko 
, Уйко 
) , across the world, is a rare last name. The family name Uiko is habitual in Malaysia, where it is a rare surname, Kazakhstan, and Russia, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Malaysia, Kazakhstan, and India. Likewise, Uiko is the forename as well as the last name.