Namesakes
Fictional Characters from Television:
1 character
Addison Montgomery (a.k.a. Forbes) 2005; 2007 Grey's Anatomy; Private Practice 
Nobel Prize Winners:
1 economics
(economics) John Forbes Nash Jr. 1994
Notable Philosophers and Thinkers:
1 mathematician
John Forbes Nash Jr. 1928-2015
Notable Politicians and Statespeople:
1 diplomat/politician
John Kerry (a.k.a. Forbes) 1943-
Other Leaders:
1 president
President Forbes Burnham 1980-1985 Guyana