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In all the world, Lief (Lief , 利夫 ) is quite a rare unisex forename. The first name Lief is characteristic of Belgium, where it is quite a rare female name, Philippines, where it is a very rare principally male, but very seldom female name, and the United States, where it is a very rare male name. Not in comparison with a country's population, it is commonest in China, Belgium, and the United States. Also, Lief is the last name as well as the forename.
Lief is also a name for the fictitious and mythical characters: Lev , the fictional character from the video game The Last of Us Part II; Prince Myshkin , the fictional character of Dostoevsky, The Idiot; Lev Abalkin and Fürst Leo Nikolajewitsch Myschkin , the operatic character in the opera Der Idiot (Weinberg), The Idiot.