Cognomen Koltz (Koltz 
) , in the world, is a rare last name. The cognomen Koltz is characteristic of Luxembourg, where it is quite a rare surname, Germany, where it is a rare surname, and the United States. In absolute terms, it most frequently occurs in the United States, Brazil, and Germany. Much less frequently, Koltz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Koltz | Brazil, Luxembourg, United States, France, Germany |
| philipp koltz (b. 1543) |
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| jean-pierre koltz LU (b. 1804) |
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| jean-pierre-joseph koltz botanist (1827-1907) (b. 1827) |
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| jean-pierre koltz (1909-1989), LU (b. 1909) |
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| rené koltz (1911-1971), LU (b. 1911) |
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| anise koltz poet, LU (b. 1928) |
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| beryl koltz Luxembourgish - French film director, FR (b. 1974) |
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| tony koltz American writer, US |
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| amanda m koltz researcher |
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| michael t koltz researcher (ORCID 0000-0002-0404-0339) |
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