| Abbreviation | Definition |
|---|---|
| F | Frank |
| F | Frederick |
| F | Fredo |
| F | Frenchy |
| F/K/A | Formerly Known As |
| FB | Faizan Bhatti |
| FB | Francois Beauregard |
| FBW | Finley Bradford Wilson |
| FC | Fame City |
| FD | Francine Dee |
| FEFE | Ferdinando |
| FG | Fredrick George |
| FGB | Franklin G. Burroughs |
| FGE | Favorite girlfriend everyday |
| FGS | For God's Sake! |
| FH | Fitzwilliam Henry |
| Finn | Finley |
| FIO | Fire Inspection Officer |
| FISHWORSHIP | Fun in the summer holidays. |
| FITZ | Fitzgerald |