Family name Welldon (Welldon 
) , in all the world, is a very rare cognomen. The surname Welldon is characteristic of Australia, where it is a rare surname, New Zealand, where it is a very rare surname, and the United Kingdom. Measured by absolute frequency, it is the most numerous in Australia, the United Kingdom, and Canada. Much less frequently, Welldon is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Welldon | United Kingdom, Australia, United States, Canada, Brazil |
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james welldon Anglican bishop (1854-1937) (b. 1854) |
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| james ind welldon (b. 1811) |
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| james welldon British cricketer (1847-1927), GB (b. 1847) |
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estela v. welldon Argentine-British psychiatrist and writer, AR (b. 1939) |
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| ellinor mary hoste welldon (1895-1997) (b. 1895) |
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| william charles hoste welldon Peerage person ID=203541 |
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| ethel barrow welldon (died 1971) |
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| w. welldon watchmaker |
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| james hoste welldon (died 1917) |
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| charles edward welldon Peerage person ID=203526 |
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| francis dixon hoste welldon (died 1980) |
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