Cognomen Raiska (Raiska 
, Раиска 
) , in the entire world, is a rare surname. The family name Raiska is habitual in Latvia, where it is quite a rare surname, New Zealand, where it is a rare surname, and Canada, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Indonesia, Latvia, and Canada. Likewise, Raiska is the forename as well as the last name.