Surname Guelfi (Guelfi 
) , worldwide, is quite a rare cognomen. The cognomen Guelfi is habitual in Uruguay, where it is quite a rare surname, Italy, and Panama. In absolute terms, it is the most numerous in Italy, Brazil, and France. Very seldom, Guelfi is the forename as well as the last name.
| giovanni battista guelfi Italian sculptor, IT (b. 1690) |
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francesco filomusi guelfi Italian teacher and politician, IT (b. 1842) |
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| angiolo guelfi Italian patriot (1803-1865), IT (b. 1803) |
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| guelfo guelfi camajani IT (b. 1837) |
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| guelfo guelfi camajani Italian genealogist and historian (b. 1857) |
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andré guelfi French racing driver (1919-2016), FR (b. 1919) |
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giangiacomo guelfi Italian opera singer (1924-2012), IT (b. 1924) |
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| piero guelfi camajani Italian heraldist (1896-1951), IT (b. 1896) |
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| aramis guelfi Italian politician, IT (b. 1905) |
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| piero guelfi Italian singer (1914-1989), IT (b. 1914) |
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| atilio garcía guelfi Uruguayan writer, UY (b. 1915) |
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| julien guelfi FR (b. 1913) |
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| carlo guelfi performer (1924-2012) (b. 1924) |
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| guelfo guelfi camajani Italian genealogist and heraldist (1928-1982), IT (b. 1928) |
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| gastón guelfi UY (b. 1918) |
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