Surname Siemssen (Siemssen 
) , in all the world, is a rare family name. The family name Siemssen is characteristic of Denmark, where it is a rare surname, Germany, and Austria. In absolute terms, it is the most numerous in Germany, the United States, and Denmark.
| VARIANT | COUNTRY |
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| Siemssen | Germany, Austria, United States, Denmark, Netherlands |
| adolph christian siemssen (b. 1768) |
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| georg theodor siemssen DE (b. 1816) |
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| hermann julius siemssen DE (b. 1817) |
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| hans august siemssen (b. 1866) |
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| rolf hendrik siemssen Ph.D. Universität Hamburg 1963 (b. 1933) |
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| rolf siemssen NL (b. 1933) |
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| annette siemssen Ph.D. University of Texas at El Paso 2018 |
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| c.h. siemssen |
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Mr, Craig, Ciara, Brian, Brent, Karen, Paula, Peter, Renee, David, Janet, Julia, Tanja, Terri, Erica, Heiko, Faith, Melvin, Sascha, Sharon, Stacey, Alicia, Carey, Pamela, Aimee, Arved, Ms, Sam, Rae, Jan, Jon, Tim, Miia, Anja, Lisa, Lynn, John, Jeff, Jill, Febe, Inge, Marie, Sadie, Siems, Steve, Alena, Alice, Adele, and Ronald