Cognomen Ketelsen (Ketelsen 
) , throughout the world, is quite a rare surname. The cognomen Ketelsen is characteristic of Denmark, where it is quite a rare surname, Germany, and the United States, where it is a rare surname. Much less frequently, Ketelsen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ketelsen | Germany, Spain, United States, Canada, Denmark |
| boy ketelsen (b. 1777) |
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| marie christine ketelsen (b. 1888) |
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| wolfgang ketelsen German navy officer and WWII submarine commander, DE (b. 1911) |
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| uwe-karsten ketelsen (b. 1938) |
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| hans-joachim ketelsen DE (b. 1945) |
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| thomas ketelsen (b. 1955) |
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| dominik ketelsen German radiologist (b. 1980) |
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| uwe-peter ketelsen researcher |
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| helge ketelsen researcher |
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| christian ketelsen Ph.D. University of Colorado at Boulder 2009 |
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| kyle ketelsen American opera singer, US |
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| magnus krickau ketelsen DK |
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| ida krickau ketelsen DK |
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