Last name Siemsen (Siemsen 
) , in the world, is quite a rare family name. The last name Siemsen is characteristic of Iceland, where it is quite a rare surname, Germany, and Denmark. Not in comparison with a country's population, it is commonest in Germany, the United States, and Australia. Much less frequently, Siemsen is the forename as well as the last name.
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| Siemsen | Germany, Australia, Brazil, United States, Argentina |
| christoph wilhelm siemsen German councillor , librarian and library secretary (b. 1793) |
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| august siemsen DE (b. 1797) |
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| enrique siemsen CL (b. 1815) |
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| peter siemsen (b. 1825) |
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| august hermann siemsen (b. 1839) |
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| anna siemsen German politician (1882-1951), DE (b. 1882) |
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| august siemsen German politician (1884-1958), DE (b. 1884) |
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| karl siemsen German politician (1887-1968), DE (b. 1887) |
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| hans siemsen German journalist, DE (b. 1891) |
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| pieter siemsen (b. 1914) |
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| karl hayo siemsen German university teacher (1944-2018), DE (b. 1944) |
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remy siemsen association football player, AU (b. 1999) |
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| arne siemsen Danish actor (b. 1956) |
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| peter siemsen Brazilian lawyer, BR (b. 1967) |
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| wiebke siemsen (b. 1963) |
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