Family name Fortnum (Fort 
, Fortnum 
) , around the globe, is a common surname. The family name Fortnum is characteristic of Saint Lucia, where it is quite a common surname, France, and Czechia (explore the name in all countries). Measured by absolute frequency, this name is the most popular in France, the United States, and Algeria. Much less frequently, Fortnum is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fort | Algeria, Spain, France, United States, Czechia |
| Fortnum | Australia, Spain, Canada, United States, United Kingdom |
| charles fortnum English royal servant and grocer (b. 1738) |
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| sophia fortnum British Gothic novelist, and poet (b. 1781/2, d. in or after 1805) (b. 1750) |
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c. drury e. fortnum English art collector and art historian (b. 1820) |
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peggy fortnum illustrator (1919-2016), GB (b. 1919) |
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| rebecca fortnum British painter, GB (b. 1963) |
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| fortnum Peerage person ID=618061 |
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| arthur john fortnum Peerage person ID=434859 |
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Mr, Tony, Toni, Emma, Megan, Sarah, Steve, Scott, Allan, Annie, Carol, Cathy, Beryl, Bruce, Bryan, Katie, Kelly, Peggy, Rosie, David, Tara, Donna, John, Jake, Ms, Ann, Amy, Rob, Jon, Joe, Eve, W R, Mary, Mark, Matt, Alan, Bill, Paul, Rich, Dave, Greg, Lisa, Jack, Josh, and Garry