Surname קירסטי (Kirsty 
, Kirstie 
, Kjersti 
) , all around the world, is a rare cognomen. The cognomen קירסטי is characteristic of Northern Europe, particularly Norway, where it is a rare surname, Ireland, and the United Kingdom. In absolute terms, it is the most numerous in the United Kingdom, Indonesia, and Australia. Much more prevalently, קירסטי is the forename as well as the last name.