Cognomen Gillmer (Gillmer 
) , globally, is a rare surname. The cognomen Gillmer is habitual in South Africa, where it is a rare surname, Australia, where it is a very rare surname, and the United States. Very seldom, Gillmer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gillmer | Canada, Australia, United States, Germany, South Africa |
| margaret gillmer (1753-1829) (b. 1753) |
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| max gillmer (b. 1857) |
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| reuben gillmer British screenwriter, GB (b. 1868) |
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| thomas c. gillmer American naval architect, US (b. 1911) |
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| merv gillmer Australian rugby league footballer, AU (b. 1924) |
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| caroline gillmer Australian actress, AU (b. 1955) |
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| bruce gillmer film and television producer, US (b. 1963) |
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