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Throughout the world, Siębor (Siębor ) is an extremely rare unknown gender forename. Much more frequently, Siębor is the last name as well as the forename.
Semba, Siebor, and Siembor
Dawid, Jacek, Robert, Michał, Andrzej, Dobrawa, Wiktoria, Agnieszka, Katarzyna, and Aleksandra