Family name Kiefl (Kiefl 
) , globally, is quite a rare cognomen. The surname Kiefl is characteristic of Western Europe, particularly Germany, where it is quite a rare surname, Austria, where it is a rare surname, and Belgium. Measured by absolute frequency, it is the most numerous in Germany, Argentina, and Austria. Much less frequently, Kiefl is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kiefl | United States, Austria, Germany, Canada, Argentina |
| franz xaver kiefl DE (b. 1869) |
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| helmut kiefl German politician, DE (b. 1942) |
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| johannes kiefl researcher |
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| gabriel m kiefl researcher |
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| evan kiefl researcher (ORCID 0000-0002-6473-0921) |
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| simone kiefl German association football player, DE (b. 1999) |
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Mr, Mandy, Sarah, Simon, Alois, Aloiz, Anton, Anian, Agnes, Achim, Chris, Bernd, Klaus, Petra, Peter, Debby, Gayle, Jakob, Josef, Jonas, Julia, Tanja, Marco, Mario, Maria, Otto, Ms, Max, Ana, Ray, Ina, Anna, Anke, Karl, Ralf, Resi, Terry, Ryan, Jose, John, Joao, Juan, Tine, Niko, Erin, Emma, Evan, Hans, Lina, and Teddi