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Worldwide, Łoniewski (Łoniewski , Лоневский ) is an extremely rare unknown gender first name. Much more frequently, Łoniewski is the last name as well as the forename.
Loniewski
Adam, Sebastian, Grzegorz, Łukasz, Dominik, Przemek, Michał, Mateusz, Tomasz, Konrad, Szymon, Maciej, Marcin, Jakub, Dawid, Rafał, Piotr, Paweł, Marek, Kuba, Krzysztof, and Przemysław