Surname Кирси (Kirsi 
, Kiersey 
, Кирси 
) , throughout the world, is a rare last name. The last name Кирси is characteristic of Northern Europe, particularly Estonia, where it is quite a rare surname, Finland, and Ireland. In absolute terms, this name is the most popular in the United States, Finland, and Ireland. More prevalently, Кирси is the forename as well as the last name.