Cognomen Westphalen (Westphalen 
) , all over the world, is quite a rare family name. The surname Westphalen is habitual in Germany, where it is quite a rare surname, Denmark, where it is a rare surname, and Peru. Not in comparison with a country's population, it most frequently occurs in Germany, Brazil, and the United States. Very seldom, Westphalen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Westphalen | Brazil, United States, Peru, Denmark, Germany |
| frederik adriaansz. westphalen (b. 1581) |
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| ursula westphalen (b. 1619) |
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| andreas westphalen (b. 1628) |
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| regina westphalen (b. 1638) |
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| jürgen westphalen DE (b. 1666) |
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friedrich wilhelm von westphalen Prince-bishop of Hildesheim and Paderborn (1727-1789), DE (b. 1727) |
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clemens august von westphalen German chamberlain (1753-1818), DE (b. 1753) |
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| philipp von westphalen (1723-1792), DE (b. 1723) |
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| johann ernst friedrich westphalen DE (b. 1757) |
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| heinrich bonaventura westphalen DE (b. 1757) |
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edgar von westphalen Communist politician, early Texas settler (1819-1890), DE (b. 1819) |
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| ludwig von westphalen Prussian aristocrat, DE (b. 1770) |
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| nicolaus adolf westphalen (1793-1854), DE (b. 1793) |
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| joseph von westphalen (b. 1785) |
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| ferdinand von westphalen German politician (1799-1876), DE (b. 1799) |
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