Last name Mertens (Mertens 
, Мартенс 
, מרטנס 
) , in the world, is a common surname. The surname Mertens is characteristic of Western Europe, particularly Belgium, where it is a common surname, Luxembourg, where it is quite a common surname, and Germany (explore the name in all countries). Measured by absolute frequency, it is commonest in Germany, Belgium, and the United States. Very seldom, Mertens is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mertens | Germany, France, United States, Netherlands, Belgium |
| Мартенс | Kazakhstan, Russia, Ukraine, Kyrgyzstan |
| מרטנס | Israel |
| Мертенс | Kazakhstan, Russia, Ukraine, Belarus |
| dietrich mertens (b. 1583) |
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| cornelis mertens Flemish painter, BE (b. 1644) |
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karl von mertens (1737-1788), AT (b. 1737) |
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johannes cornelis mertens painter from the Northern Netherlands (1742-1823), NL (b. 1742) |
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franz carl mertens German botanist (1764-1831), DE (b. 1764) |
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frans hendrik mertens Belgian librarian and historian, BE (b. 1796) |
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| hieronymus andreas mertens (b. 1743) |
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| philippus mertens (b. 1753) |
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| johann anton mertens (b. 1755) |
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| christoph karl mertens DE (b. 1756) |
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| peter von mertens (b. 1773) |
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konrad mertens priest and historian (1836-1905), DE (b. 1836) |
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franz mertens Polish-Austrian mathematician, AT (b. 1840) |
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| johann ludwig josef mertens (b. 1781) |
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| anton mertens DE (b. 1782) |
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