Surname Fortmann (Fortmann 
) , globally, is quite a rare family name. The last name Fortmann is habitual in Lesotho, where it is quite a rare surname, Germany, and Mali, where it is a rare surname. Not in comparison with a country's population, it is commonest in Germany, the United States, and South Africa.
| VARIANT | COUNTRY |
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| Fortmann | Germany, South Africa, United States, Mali, France |
| johannes fortmann German librarian and theologian, DE (b. 1576) |
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| johann gottfried fortmann DE (b. 1753) |
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| heinrich fortmann (b. 1805) |
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| wilhelm fortmann DE (b. 1814) |
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| heinrich fortmann DE (b. 1842) |
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| franz fortmann German politician and journalist (1877-1935), DE (b. 1877) |
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| meinard fortmann DE (b. 1891) |
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| herman fortmann Dutch theologian and priest, NL (b. 1904) |
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| han m. m. fortmann Fortmann, Han (Henricus Martinus Maria), 1912-1970, NL (b. 1912) |
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| dan fortmann American football player (1916-1995), US (b. 1916) |
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| tommy fortmann Swiss composer, CH (b. 1951) |
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| ludger a. fortmann (b. 1969) |
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| charles fortmann researcher ORCID ID = 0000-0003-1416-5060 |
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| karolina fortmann German association football player, DE |
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| caroline fortmann researcher |
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