Last name Neelsen (Neelsen 
) , around the world, is a rare surname. The cognomen Neelsen is habitual in Bahrain, where it is a rare surname, Germany, and Norway, where it is a very rare surname. Measured by absolute frequency, the name is most common in Germany, the United States, and Bahrain. Much less frequently, Neelsen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Neelsen | Bahrain, United States, South Africa, Malaysia, Germany |
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friedrich neelsen German pathologist, microbiologist, DE (b. 1854) |
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| hans friedrich neelsen DE (b. 1821) |
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| elisabeth neelsen DE (b. 1870) |
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| ulf-kersten neelsen DE (b. 1964) |
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| kai j neelsen researcher ORCID ID = 0000-0002-8035-5914 |
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| sven neelsen researcher |
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| johannes neelsen |
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Mr, Wolf, Marco, Maike, Scott, Amala, Craig, Bambi, Betsy, Bryan, Karin, Kevin, Klaus, Petra, David, Greta, Lizzi, Jason, Juana, Nancy, Niels, Haley, Olaf, Inke, Erik, Nina, Ms, Kai, Jan, Uta, Uwe, Marc, Sven, Anna, Anne, Karl, Folke, Ralf, Ruth, Ryan, Lara, Lars, Jane, Jodi, Jens, Todd, Timm, Nick, Rolf, and Marten