Cognomen Kortz (Kortz 
) , globally, is quite a rare surname. The last name Kortz is habitual in Germany, where it is a rare surname, Sweden, and Netherlands. In absolute terms, it is commonest in the United States, Germany, and Brazil. Very seldom, Kortz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kortz | Germany, Sweden, Brazil, United States, Poland |
| paul kortz technician and mechanical technician (b. 1850) |
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| friedrich kortz DE (b. 1866) |
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ulrich kortz chemist, DE (b. 1963) |
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| william c. kortz American politician, US (b. 1954) |
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| rüdiger kortz DE (b. 1955) |
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| alessandra r. kortz researcher ORCID ID = 0000-0002-7473-1987 |
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| tommy kortz college basketball player (1955–1955) Mississippi |
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| teresa bleakly kortz researcher |
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| linda kortz researcher |
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| benedikt kortz (b. 1978) |
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| daniel kortz |
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