Cognomen Effertz (Effertz 
) , in the entire world, is quite a rare family name. The surname Effertz is habitual in Germany, where it is quite a rare surname, Portugal, where it is a rare surname, and the United States.
| VARIANT | COUNTRY |
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| Effertz | United States, France, Portugal, Germany, Netherlands |
| peter effertz American politician – Minnesota -House 1907-08 (District 25), US (b. 1845) |
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| otto effertz German economist, DE (b. 1856) |
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| reinhard effertz DE (b. 1848) |
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horst effertz German rower, DE (b. 1938) |
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| josef effertz German politician (1907-1984), DE (b. 1907) |
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julia effertz DE (b. 1980) |
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| heinrich effertz (b. 1933) |
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| wilfried effertz German politician, DE (b. 1950) |
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| karin effertz (b. 1941) |
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| dirk effertz DE (b. 1958) |
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| thomas effertz researcher |
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| scott effertz college basketball player (1996–1998) Kent State |
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| egon effertz victim of far-right hate crime in Germany killed in 1999, DE |
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| tobias effertz (b. 1975) |
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| paul effertz |
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