Family name Mortelmans (Mortelmans 
) , in the world, is quite a rare cognomen. The last name Mortelmans is characteristic of Western Europe, particularly Belgium, where it is quite a common surname, France, where it is a rare surname, and Netherlands. Not in comparison with a country's population, it most frequently occurs in Belgium, France, and Poland. Very seldom, Mortelmans is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mortelmans | Belgium, Italy, Poland, France, United Kingdom |
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lodewijk mortelmans Belgian composer (1868-1952), BE (b. 1868) |
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| frans mortelmans Belgian painter (1865-1936), BE (b. 1865) |
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| franck mortelmans 1898-1986 pastellist, BE (b. 1898) |
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| august mortelmans Belgian cyclist (1901-1985), BE (b. 1901) |
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| ivo mortelmans Belgian conductor and musicologist, BE (b. 1901) |
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| georges mortelmans botanical collector, BE (b. 1910) |
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| john mortelmans Belgian sports coach (1910-1983), BE (b. 1910) |
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| edward mortelmans British artist, GB (b. 1915) |
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| jef mortelmans (b. 1924) |
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| jos mortelmans BE (b. 1924) |
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mathieu mortelmans BE (b. 1985) |
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| kamiel mortelmans Dutch jurist, NL (b. 1946) |
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| kamiel mortelmans Dutch university teacher, NL (b. 1946) |
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| luc mortelmans BE (b. 1947) |
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| hans mortelmans Belgian photographer, BE (b. 1963) |
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