Cognomen Лешек (Leszek 
, Лешек 
) , all over the world, is a widespread family name. The last name Лешек is habitual in Poland, where it is a widespread surname, Puerto Rico, where it is quite a rare surname, and Ireland, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Poland, the United States, and Puerto Rico. Very seldom, Лешек is the forename as well as the last name.