Surname Jannsen (Jannsen 
) , all over the world, is a rare family name. The last name Jannsen is characteristic of Germany, where it is a rare surname, Denmark, and Estonia. Measured by absolute frequency, it is the most numerous in Germany, the United States, and Denmark. Much less frequently, Jannsen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jannsen | Germany, Denmark, Philippines, United States, Indonesia |
| harry jannsen German-Estonian journalist, editor and translator, EE (b. 1851) |
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| eugen friedrich reinhold jannsen EE (b. 1853) |
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uwe jannsen German mathematician, DE (b. 1954) |
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| herrlich jannsen (b. 1906) |
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| gert jannsen German politician and athletics competitor, DE (b. 1939) |
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| arne jannsen |
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| johann jannsen |
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Mr, Karl, Kent, Kees, Kurt, Paul, Piet, Ralf, Rolf, Ryan, Dawn, Dino, Dirk, Gert, Leon, Leif, Lena, Lisa, Lori, Jana, Jann, John, Kara, Joni, Beth, Anna, Ms, Jo, Max, Mia, Kan, Kim, Roy, Dan, Jan, Jed, Jim, Tim, Nic, Ove, Udo, Uwe, Marc, Mary, Sara, Sean, Sven, Anne, and Joan