Cognomen Koontz (Koontz 
, קונץ 
) , all around the world, is a common last name. The cognomen Koontz is characteristic of the United States, where it is quite a rare surname, New Zealand, where it is a rare surname, and Canada. Not in comparison with a country's population, the name is most common in the United States, Canada, and Indonesia.
| VARIANT | COUNTRY |
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| Koontz | Indonesia, Canada, United States, Sweden, Colombia |
| קונץ | Israel |
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william henry koontz American politician (1830-1911), US (b. 1830) |
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| mary koontz (1847-1923) (b. 1847) |
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| henriette koontz (1849-1917) (b. 1849) |
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elizabeth duncan koontz American educator (1919-1989), US (b. 1919) |
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roscoe l. koontz American physicist (1922 - 1997), US (b. 1922) |
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| bessie b. koontz (b. 1893) |
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robin koontz American writer and illustrator, US (b. 1954) |
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| harold koontz American business consultant, US (b. 1909) |
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charley koontz American actor, US (b. 1987) |
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| lawrence l. koontz, jr. American politician, US (b. 1940) |
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stephe koontz US |
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| dean r. koontz American author, US (b. 1945) |
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| joe koontz former American football wide receiver, US (b. 1945) |
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| ed koontz football player (born 1946) (b. 1946) |
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| christie koontz (b. 1949) |
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