Last name Madaj (Madaj 
) , all over the world, is quite a rare cognomen. The family name Madaj is habitual in Eastern Europe, particularly Slovakia, where it is quite a rare surname, Poland, and Czechia, where it is a rare surname. In absolute terms, it most frequently occurs in Poland, Slovakia, and the United States. Likewise, Madaj is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Madaj | Slovakia, United States, France, Poland, Germany |
| feliks madaj FR (b. 1926) |
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| karol madaj (b. 1935) |
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| milan madaj Slovak ski mountaineer, SK (b. 1970) |
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| katarzyna madaj-kozłowska PL (b. 1969) |
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| zachary madaj researcher |
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| janusz madaj researcher |
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| karol madaj Board game designer, PL (b. 1980) |
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| casimir madaj French resistance fighter |
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| marek madaj (b. 1972) |
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| natalia madaj Polish rower, PL (b. 1988) |
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| martin madaj (b. 1982) |
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