Family name Clontz (Clontz 
) , all around the world, is quite a rare cognomen. The last name Clontz is characteristic of the United States, where it is a rare surname, Canada, where it is a very rare surname, and Germany, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Clontz | United Kingdom, United States, Bermuda, Germany, Canada |
| dennis clontz American journalist (1951-2004), US (b. 1951) |
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| brad clontz American baseball player, US (b. 1971) |
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| steven craig clontz Ph.D. Auburn University 2015 |
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