Cognomen Demetr (Demetr 
) , all around the world, is a very rare surname. The cognomen Demetr is habitual in Czechia, where it is a rare surname, and Venezuela, where it is an extremely rare surname. Very seldom, Demetr is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Demetr | Venezuela, Czechia, United States |
| demetr jurkuc UA (b. 1906) |
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| demetr zub UA (b. 1912) |
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| demetr doubaka UA (b. 1913) |
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| demetr kopták SK (b. 1917) |
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| jan demetr CZ (b. 1922) |
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| demetr jurtin CZ (b. 1924) |
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