Surname Merkens (Merkens 
) , globally, is quite a rare cognomen. The cognomen Merkens is habitual in Germany, where it is quite a rare surname, Netherlands, where it is a rare surname, and Portugal. In absolute terms, it is commonest in Germany, Netherlands, and the United States. Much less frequently, Merkens is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Merkens | Netherlands, Portugal, Canada, United States, Germany |
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peter heinrich merkens German merchant, entrepreneur and politician, DE (b. 1777) |
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| matthias daniel merkens (b. 1740) |
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| jakob merkens (b. 1808) |
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| franz merkens (b. 1823) |
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| erich merkens (b. 1864) |
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| toni merkens German racing cyclist, DE (b. 1912) |
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| hans merkens DE (b. 1937) |
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| guido merkens American football player, US (b. 1955) |
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| sabine merkens biologist (b. 1969) |
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| stefan merkens researcher (ORCID 0000-0001-5635-8659) |
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| franz ferdinand merkens |
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| j. merkens |
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| tom christian merkens German footballer, DE (b. 1990) |
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| j. merkens |
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| jan-ludolf merkens |
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