Last name Kaefer (Kaefer 
, Käfer 
) , in the world, is quite a common surname. The last name Kaefer is characteristic of Austria, where it is quite a common surname, Germany, where it is quite a rare surname, and Paraguay. Measured by absolute frequency, it is commonest in Germany, Brazil, and Austria. Very seldom, Kaefer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kaefer | Germany, Austria, Paraguay, United States, Brazil |
| Käfer | Germany, Austria, Spain, United States, Brazil |
| victor kaefer poet (b. 1799) |
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| rudolf kaefer German politician (1876-1923), DE (b. 1876) |
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alfredo kaefer Brazilian politician, BR (b. 1955) |
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| herbert kaefer DE (b. 1938) |
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| ademir roque kaefer Association footballer, BR (b. 1960) |
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| josé ademar kaefer (b. 1960) |
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| john kaefer American composer, US (b. 1976) |
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| tana n kaefer researcher |
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| martin kaefer professor of urology |
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| igor l. kaefer Brazilian herpetologist, BR |
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| tanya kaefer researcher ORCID ID = 0000-0002-2562-0965 |
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| tanya kaefer (b. 1980) |
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| cíntia c. kaefer |
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