Family name Kaatz (Kaatz 
, כץ 
) , globally, is a common cognomen. The cognomen Kaatz is habitual in Israel, where it is quite a common surname, Paraguay, where it is quite a rare surname, and Germany. Measured by absolute frequency, the name is most common in Israel, Germany, and the United States. Much less frequently, Kaatz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kaatz | Germany, Canada, Paraguay, United States, Poland |
| כץ | Israel |
| gustav adolph kaatz (b. 1829) |
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| johanna kaatz holocaust victim, b. 1877-01-22 (b. 1877) |
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| sophie kaatz holocaust victim, b. 1877-05-07, DE (b. 1877) |
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| saul kaatz (b. 1870) |
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| kurt kaatz (b. 1911) |
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| karl kaatz PL (b. 1913) |
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| christopher kaatz DE (b. 1954) |
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| glenn w kaatz researcher |
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| wayne kaatz American screenwriter, US |
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| julie kaatz Australian cricketer |
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| forrest h kaatz researcher (ORCID 0000-0001-7912-0627) |
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| scott kaatz researcher |
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| kevin kaatz researcher |
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| jenny kaatz Norwegian actress, SE (b. 1985) |
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| benjamin kaatz |
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