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Worldwide, Leoncjusz (Леонтий , Leoncjusz ) is a common masculine first name. The first name Leoncjusz is characteristic of Kazakhstan, where it is quite a rare masculine name, Russia, and Kyrgyzstan, where it is a rare boy's name. Measured by absolute frequency, it is the most numerous in Russia, Kazakhstan, and Ukraine. Much less frequently, Leoncjusz is the last name as well as the forename.
Iwanczuk, and Leszczynski