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Last name Stelmach (Stelmach , Стельмах , Стэльмах ) , throughout the world, is a common cognomen. The last name Stelmach is habitual in Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, and Poland. Measured by absolute frequency, the name is most common in Eastern Europe, particularly Ukraine, Poland, and Russia. Likewise, Stelmach is the forename as well as the last name.