Cognomen Kleffel (Kleffel 
) , across the world, is a rare last name. The family name Kleffel is habitual in Denmark, where it is a rare surname, Germany, and Switzerland. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Denmark.
| VARIANT | COUNTRY |
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| Kleffel | Germany, Hong Kong, Switzerland, United States, Denmark |
| johann andreas kleffel (b. 1698) |
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| johann david kleffel DE (b. 1700) |
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| johann gottlieb kleffel (b. 1740) |
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heinrich kleffel German judge and jurist (1811-1896), DE (b. 1811) |
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| gustav kleffel (b. 1775) |
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arno kleffel German composer (1840-1913), DE (b. 1840) |
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| rudolf kleffel German jurist (1815-1895), DE (b. 1815) |
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| ludwig gustav kleffel DE (b. 1807) |
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| richard kleffel RU (b. 1850) |
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| philipp kleffel German General and Knight's Cross recipients, DE (b. 1887) |
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| paul-georg kleffel German career soldier and officer, DE (b. 1920) |
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| hellmut kleffel DE (b. 1917) |
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| siegfried kleffel functionary in the German Democratic Republic and, previously, member of the Nazi party, DE (b. 1927) |
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| harry kleffel German officer, DE (b. 1929) |
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Mr, Antje, Craig, Bernd, Betty, Karen, Keith, Kevin, Kjeld, David, Gerda, Georg, Lukas, Janet, Janni, James, Julia, Julie, Tanya, Niels, Erika, Helga, Sonja, Sille, Marie, Olaf, Bo, Pia, Roy, Jan, Mary, Mark, Stev, Anne, Anja, Arnd, Heidi, Carl, Brad, Paul, Ralf, Rick, Lion, John, Jens, Nici, Nils, Falk, Cody, and Verna