Family name Sweetnam (威楠 
, Sweetnam 
, น้ำหวาน) , in all the world, is quite a rare last name. The last name Sweetnam is characteristic of Ireland, where it is quite a rare surname, Australia, where it is a rare surname, and Canada. Not in comparison with a country's population, it most frequently occurs in the United States, Ireland, and the United Kingdom. Much less frequently, Sweetnam is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 威楠 | China |
| Sweetnam | United Kingdom, South Africa, Ireland, United States, Canada |
| john sweetnam Sweetnam [Swetnam], John (1579–1622), Jesuit (b. 1579) |
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rodney sweetnam British orthopaedic surgeon (1927-2013), GB (b. 1927) |
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| william perrott sweetnam b.10 September 1915 d.27 May 1974 (b. 1915) |
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skye alexandra sweetnam Canadian singer, CA (b. 1988) |
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| peter sweetnam medical statistician (b. 1941) |
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| nancy sweetnam Canadian swimmer, Olympic athlete, world championship silver medallist, CA (b. 1973) |
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| barry gregory sweetnam AU (b. 1968) |
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| frank a. sweetnam Peerage person ID=485124 |
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| francis sweetnam Peerage person ID=331951 |
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| trevor sweetnam researcher, ORCID id # 0000-0002-4264-8978 |
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| george sweetnam (died 1930) |
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| henrietta elizabeth frances sweetnam Peerage person ID=331952 |
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| shane sweetnam Irish equestrian, IE (b. 1981) |
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| mark s. sweetnam |
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| darren sweetnam Irish hurler and rugby union player, IE (b. 1993) |
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