Cognomen Westerman (Westerman 
, Вестерман 
) , all over the world, is quite a common surname. The last name Westerman is characteristic of Netherlands, where it is quite a rare surname, the United Kingdom, and Australia. In absolute terms, it is the most numerous in the United States, the United Kingdom, and Netherlands.
| VARIANT | COUNTRY |
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| Westerman | United Kingdom, Australia, United States, Canada, Netherlands |
| Вестерман | Russia, Ukraine |
Vestermane, Vestermanis, Westermann, Вестерманн, and ชาวตะวันตก
| adam westerman (b. 1550) |
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| hans westerman Alsatian explorer (1660-1721), FR (b. 1660) |
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| anders svensson westerman (1672-1739), SE (b. 1672) |
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gerardus frederik westerman Dutch director and zoologist, NL (b. 1807) |
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| marten westerman NL (b. 1775) |
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| anna westerman Dutch actor, NL (b. 1802) |
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johanna westerman Dutch politician (1866-1943), NL (b. 1866) |
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harry james westerman US (b. 1876) |
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| wilhelm marten westerman Military officer, NL (b. 1839) |
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william marten westerman Dutch politician and writer (1892-1950), NL (b. 1892) |
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| willem westerman Dutch private banker (1864–1935), NL (b. 1864) |
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| percy f. westerman English writer known for children's books featuring navy, sea, or war (b. 1876) |
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| cornelis willem johannes westerman (b. 1867) |
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| kornelius westerman Dutch architect, NL (b. 1892) |
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allan westerman (b. 1934) |
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