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Family name Leoncjusz (Леонтий
, Leoncjusz
) , worldwide, is a rare last name. The cognomen Leoncjusz is habitual in Poland, where it is quite a rare surname, Kyrgyzstan, where it is a rare surname, and Russia, where it is a very rare surname. Much more prevalently, Leoncjusz is the forename as well as the last name.
Iwanczuk, and Leszczynski