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Family name Lasn (拉森 , Lasn , לאסן ) , in all the world, is a rare cognomen. The surname Lasn is characteristic of Estonia, where it is quite a common surname, Israel, where it is a very rare surname, and Canada. In absolute terms, it is commonest in Estonia, Canada, and the United States. Much less frequently, Lasn is the forename as well as the last name.