I've had a few, mostly because it took ages for my friends to stop changing their mind as to my name.
Fi, Fi-fi, Fi Tree, Winona (don't ask me why), Fona, Nona, Nonapedia, Noni, John, Gingy, Bluey, Fiji, Fiona Mark 2, Tank (Internet nicknames count!), Big Dog, Red, Big Red, aaaand Matchstick.
Bet you can't guess what colour my hair is.