Family name Keil (Cale 
, Keil 
, Kayles 
) , globally, is a common cognomen. The last name Keil is characteristic of Germany, where it is quite a common surname, Austria, where it is quite a rare surname, and Namibia. In absolute terms, the name is most common in Germany, the United States, and Philippines. Very seldom, Keil is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cale | Brazil, Philippines, United Kingdom, United States, Germany |
| Keil | Philippines, United Kingdom, United States, Germany, Austria |
| Kayles | Brazil, United Kingdom, United States, Venezuela, South Africa |
| Кейль | Kyrgyzstan, Kazakhstan, Belarus, Ukraine, Russia |
| ambrosius keil DE (b. 1561) |
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| johann keil (b. 1608) |
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| franz erdmann keil DE (b. 1656) |
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| david keil 7 Dec 1680 - 5 Sep 1747, DE (b. 1680) |
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karl august gottlieb keil German theologian, DE (b. 1754) |
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| friedrich sigismund keil 9 Oct 1717 - 5 May 1766, DE (b. 1717) |
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| friedrich sigismund keil (b. 1717) |
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johann georg keil German author (1781-1857), DE (b. 1781) |
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| johanne katherine christiane keil 3 Apr 1756 - 4 Mar 1820, DE (b. 1756) |
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carl friedrich keil German Lutheran theologian and Old Testament commentator, DE (b. 1807) |
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william keil founder of a Utopian community, US (b. 1812) |
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ernst keil German bookseller (1816–1878), DE (b. 1816) |
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franz keil Austrian cartographer (1822-1876), AT (b. 1822) |
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heinrich keil German classical philologist, DE (b. 1822) |
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| georg christian keil DE (b. 1764) |
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