Cognomen Dewdney (Dewdney 
) , throughout the world, is a rare surname. The surname Dewdney is habitual in Jamaica, where it is quite a rare surname, New Zealand, and the United Kingdom, where it is a rare surname. In absolute terms, it is the most numerous in the United Kingdom, the United States, and Ivory Coast. Very seldom, Dewdney is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Dewdney | Jamaica, United Kingdom, Ivory Coast, United States, Canada |
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edgar dewdney Canadian politician (1835-1916), CA (b. 1835) |
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| alfred dewdney Anglican bishop (b. 1863) |
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| selwyn dewdney Canadian author and artist (1909–1979), CA (b. 1909) |
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anna dewdney author, US (b. 1965) |
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| tom dewdney Jamaican cricketer, JM (b. 1933) |
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| john christopher dewdney (b. 1928) |
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| alexander keewatin dewdney Canadian mathematician, CA (b. 1941) |
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patrick k. dewdney GB (b. 1984) |
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| heather dewdney cricketer (born 1947), GB (b. 1947) |
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| andrew dewdney British photographer, GB (b. 1948) |
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| christopher dewdney Canadian poet, CA (b. 1951) |
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| alice dewdney researcher |
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| henry dewdney Peerage person ID=592353 |
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| edgar dewdney Peerage person ID=607885 |
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| m. dewdney researcher, ORCID id # 0000-0003-1905-7616 |
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