Cognomen Otter (Otter 
, אוטר 
, Оттер 
) , throughout the world, is a common surname. The surname Otter is habitual in Western Europe, particularly Netherlands, where it is quite a common surname, Austria, where it is quite a rare surname, and Switzerland. Measured by absolute frequency, the name is most common in Netherlands, Germany, and the United States. Very seldom, Otter is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Otter | Netherlands, United States, United Kingdom, Germany, Austria |
| אוטר | Israel |
| Оттер | Ukraine, Kyrgyzstan, Russia |
| นาคนก | Thailand |
| jakob otter German theologian, DE (b. 1485) |
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| casten otter SE (b. 1589) |
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| salomon von otter (b. 1693) |
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| johan otter SE (b. 1707) |
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william otter British bishop (1768-1840), GB (b. 1768) |
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| edward otter (1724-1785) (b. 1724) |
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| franz joseph otter German composer, DE (b. 1760) |
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| otter woman Shoshone woman (b. 1786) |
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| carl arvid von otter (b. 1783) |
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william dillon otter Canadian general, CA (b. 1843) |
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| william otter (b. 1787) |
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| william bruère otter Archdeacon of Lewes (b. 1805) |
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| sophia otter (1807-1889) (b. 1807) |
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| henry charles otter British Royal Navy officer and hydrographic surveyor (1807-1876), GB (b. 1807) |
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| caroline charlotte otter (1809-1856) (b. 1809) |
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