Family name Wilmarth (Wilmarth 
) , in the entire world, is a rare surname. The last name Wilmarth is habitual in the United States, where it is a rare surname, Canada, where it is a very rare surname, and Costa Rica. In absolute terms, it most frequently occurs in the United States, Canada, and Venezuela. Very seldom, Wilmarth is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Wilmarth | Philippines, Canada, South Africa, Venezuela, United States |
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lemuel everett wilmarth American painter, US (b. 1835) |
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| phila osgood wilmarth American physician, US (b. 1806) |
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| albert w. wilmarth American politician, US (b. 1856) |
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| anna wilmarth ickes reformer and Illinois state legislator, US (b. 1873) |
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| wilmarth sheldon lewis American collector and bibliographer (1895-1979), US (b. 1895) |
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| william h. wilmarth American sound engineer (1904-1999), US (b. 1904) |
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| dick wilmarth musher, US (b. 1942) |
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| christopher wilmarth American artist, US (b. 1943) |
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| constance wilmarth Ph.D. University of California, Davis 2008 |
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| estella wilmarth researcher ORCID ID = 0000-0002-5405-8529 |
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| phillip a wilmarth researcher |
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| verl richard wilmarth geologist |
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| mary grace wilmarth Clerk, USGS |
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| steven albert wilmarth Ph.D. Texas A&M University 1999 |
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| william a. wilmarth |
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