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In all the world, Łęszczak (Łęszczak ) is an extremely rare unknown gender first name. Much more frequently, Łęszczak is the last name as well as the forename.
Leszczak
Anna, Marta, Magda, Filip, Marcin, Patryk, Damian, Mariusz, Michał, Wiesław, Grzegorz, Sebastian, and Agnieszka