In the world, Williamson (Williamson 
, ויליאמסון 
, ウィリアムソン) is quite a rare epicene forename. The forename Williamson is characteristic of Nigeria, where it is a rare unisex name, Tanzania, where it is a rare male name, and the Dominican Republic. In absolute terms, the name is most common in Nigeria, Tanzania, and Philippines. Much more frequently, Williamson is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Williamson | Australia, Canada, Jamaica, United Kingdom, United States |
| ויליאמסון | Israel |
Williamsen, Williamsoñ, Williamsson, Willîamson, Виллиамсон, Вільямсон, and วิลเลียมสัน
Williamson is also a name for the fictitious and mythical characters: .
| sir hedworth williamson, 6th bt. (1751-1810) (b. 1751) |
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| archibald williamson (1787-1847) (b. 1787) |
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| lewis pugh williamson politician (b. 1801) |
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wallace williamson Moderator of the Church of Scotland (b. 1856) |
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archibald williamson, 1st baron forres Scottish businessman and Liberal politician (1860-1931), GB (b. 1860) |
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| daniell alexander williamson British artist (1823-1903), GB (b. 1823) |
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erskine douglas williamson (1886-1923), GB (b. 1886) |
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| archibald williamson Swedish army captain and member of parliament, SE (b. 1838) |
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| montague williamson Archdeacon of Bodmin (b. 1863) |
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| sir hedworth williamson, 9th bt. (1867-1942) (b. 1867) |
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ellis w. williamson United States Army general, US (b. 1918) |
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| norris c. williamson American politician and planter, US (b. 1874) |
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duncan williamson Scottish writer, GB (b. 1928) |
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| ray f. williamson American politician, US (b. 1883) |
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| hudleston noel hedworth williamson (born 1886), GB (b. 1886) |
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