I used a handle involving part of my real name, since I disliked it and since I discovered empirically that my handle was a lot more memorable to people. However, the comment about desiring to separate one's radio life and one's private life is also right on; luckily stalkers weren't really a problem when I was on the air. What I do find interesting is that these days more people are using their real names, often very ethnic sounding, but sometimes its part of what makes them memorable. However, some people's names just don't have a easy flow to them, or are words that just lay there - e.g., would Judy Garland have been as big a star if she'd stayed with Frances Gumm? Or if Tony Curtis had remained Bernie Schwartz?
BTW, there's an interesting name story regarding WMEX, the perpetual #2 rocker in Boston. The only jock who used his real name was Arnie Ginsberg. The other station names were associated with airshifts - Fenway ("Did you Fenway it this morning?"), Melvin X. Melvin, and several others - and were copyrighted by the station. So if a jock wanted a raise, management would say, "Who are you? You're Fenway (or Melvin, etc.). THAT's who they're listening to. You, Joe Schmuckatelli, are replaceable. Goodbye!"