Last name Krefft (Krefft 
, קרפט 
) , in the world, is quite a rare cognomen. The family name Krefft is characteristic of Poland, where it is a rare surname, Israel, and Germany. Not in comparison with a country's population, it is the most numerous in Germany, Poland, and the United States. Also, Krefft is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Krefft | Germany, Chile, United States, Poland, Netherlands |
| קרפט | Israel |
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johann ludwig gerard krefft German-Australian zoologist and palaeontologist (1830-1881), AU (b. 1830) |
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| adolf krefft German politician (1863-1936), DE (b. 1863) |
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| konstantyn krefft Polish priest, PL (b. 1867) |
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| ottomar krefft (b. 1861) |
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| osvaldo koch krefft CL (b. 1896) |
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| gerhard krefft German ichthyologist and herpetologist (1912–1993), DE (b. 1912) |
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| siegfried krefft German physician, DE (b. 1916) |
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| karol józef krefft (b. 1907) |
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| gerda barbara krefft (b. 1934) |
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| daniel andreas krefft Dr. rer. nat. Technische Universität München 2019 |
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| jacinta maria krefft New Zealander awarded QSM in 2022 for services to youth, NZ |
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| daria krefft researcher ORCID ID = 0000-0003-3777-0343 |
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| silpa d krefft researcher (ORCID 0000-0003-4808-3549) |
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| maja krefft researcher |
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| paweł krefft PL (b. 1996) |
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