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.
| leoncjusz ciuciura Polish composer, PL (b. 1930) |
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Iwanczuk, and Leszczynski