Cognomen Siefkes (Siefkes 
) , around the world, is a rare last name. The family name Siefkes is characteristic of Germany, where it is a rare surname, Netherlands, and the United States, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Siefkes | Germany, United States, Canada, Brazil, Netherlands |
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wilhelmine siefkes German translator, DE (b. 1890) |
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| dirk siefkes mathematician and computer scientist, DE (b. 1938) |
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| frauke siefkes (b. 1939) |
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| christian siefkes Dr. rer. nat. Freie Universität Berlin 2007 |
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| heather m siefkes researcher (ORCID 0000-0003-3325-2821) |
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| hermannus siefkes Dr. rer. pol. Friedrich-Schiller-Universität Jena 1934 |
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| martin siefkes (b. 1977) |
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| patrick siefkes German footballer, DE (b. 1990) |
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| christoph siefkes German footballer, DE (b. 1991) |
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Mr, Ryan, Dean, Dave, Dick, Doug, Lisa, Lois, John, Joan, Jill, Tara, Tina, Nate, Eric, Erik, Faye, Imke, Marie, Marko, Megan, Sarah, Rolf, Phil, Kent, Koen, Jo, Sam, Amy, Bob, Pam, Don, Jan, Jay, Joe, J G, Sheri, Tom, Tim, Ida, Zak, Mark, Mike, Sara, Anna, Arno, Brad, Kara, Ted, and Susan