Surname Mikolajczak (Mikolajczak 
, Mikołajczak 
) , around the world, is quite a common family name. The surname Mikolajczak is characteristic of Poland, where it is quite a common surname, Belgium, where it is quite a rare surname, and France. Measured by absolute frequency, it is commonest in Poland, Germany, and France. Likewise, Mikolajczak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mikolajczak | Germany, Belgium, United States, Poland, France |
| Mikołajczak | Germany, United Kingdom, United States, Poland, Netherlands |
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christian mikolajczak German footballer, DE (b. 1981) |
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| georgette mikolajczak French politician, FR (b. 1946) |
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| detlef mikolajczak German footballer, DE (b. 1964) |
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| renata mikolajczak researcher (ORCID 0000-0002-6882-751X) |
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| dorian j mikolajczak researcher (ORCID 0000-0003-4239-5824) |
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| sebastian a. mikolajczak researcher |
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| moïra mikolajczak researcher ORCID ID = 0000-0002-7333-1578 |
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| dariusz mikolajczak American judoka, US (b. 1982) |
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| michael mikolajczak |
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| celina mikolajczak |
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| lucien mikolajczak |
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| celina mikolajczak American astronomer, US |
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