Surname Tönnis (Tönnis 
) , in the entire world, is a rare family name. The cognomen Tönnis is habitual in Germany, where it is a rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Tönnis is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tönnis | Germany, United States |
| cord tönnis (b. 1505) |
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| tönnis johann von wrangel (b. 1627) |
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| tönnis johann von bellingshausen (b. 1634) |
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| wilhelm tönnis German neurosurgeon, DE (b. 1898) |
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| dietrich tönnis DE (b. 1927) |
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| gisbert tönnis DE (b. 1939) |
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| alfred tönnis German priest, DE (b. 1959) |
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| lutz-ekkehard tönnis (b. 1950) |
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| tönnis bulthuis Dutch police officer, NL |
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| tönnis johann von bellingshausen 1712 in St. Petersburg |
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| tönnis von asserien |
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| max tönnis |
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