Last name Undritz (Undritz 
) , in the world, is a very rare family name. The surname Undritz is habitual in Estonia, where it is a rare surname, Germany, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Much less frequently, Undritz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Undritz | Germany, South Africa, Estonia, United States, United Kingdom |
| adolf oskar undritz Estonian clergyman, EE (b. 1864) |
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| paul undritz (b. 1854) |
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| aleksander undritz (b. 1866) |
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| erik undritz Swiss physician (1901-1984), CH (b. 1901) |
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| wilhelm undritz (b. 1891) |
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| nicola undritz German film editor, DE (b. 1960) |
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| philip undritz |
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| christina undritz |
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| sven undritz |
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