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.
| VARIANT | COUNTRY |
|---|---|
| Guelfi | Brazil, Italy, France, Australia, Argentina |
| giovanni battista guelfi Italian sculptor, IT (b. 1690) |
|
|
|
francesco filomusi guelfi Italian teacher and politician, IT (b. 1842) |
|
| angiolo guelfi Italian patriot (1803-1865), IT (b. 1803) |
|
|
| guelfo guelfi camajani IT (b. 1837) |
|
|
| guelfo guelfi camajani Italian genealogist and historian (b. 1857) |
|
|
|
andré guelfi French racing driver (1919-2016), FR (b. 1919) |
|
|
giangiacomo guelfi Italian opera singer (1924-2012), IT (b. 1924) |
|
| piero guelfi camajani Italian heraldist (1896-1951), IT (b. 1896) |
|
|
| aramis guelfi Italian politician, IT (b. 1905) |
|
|
| piero guelfi Italian singer (1914-1989), IT (b. 1914) |
|
|
| atilio garcía guelfi Uruguayan writer, UY (b. 1915) |
|
|
| julien guelfi FR (b. 1913) |
|
|
| carlo guelfi performer (1924-2012) (b. 1924) |
|
|
| guelfo guelfi camajani Italian genealogist and heraldist (1928-1982), IT (b. 1928) |
|
|
| gastón guelfi UY (b. 1918) |
|