Surname Лейф (Leif 
, Leifur 
, Leyf 
) , across the world, is quite a rare family name. The cognomen Лейф is habitual in Northern Europe, particularly Estonia, where it is quite a rare surname, Sweden, and Iceland. In absolute terms, this name is the most popular in the United States, Sweden, and Germany. Much more frequently, Лейф is the forename as well as the last name.