Doesn't bother me in the slightest -- my initials are AJ, and that is my name I commonly use as well.

I also respond to a variety of names, including my (much more common) online handle, and with some friends in person the names will be used interchangably, and we have some friends with duplicate names so people will usually just have one name dropped. E.g. my friend Beau is always called Oddy, because of another friend called Bo... I don't think it's much different from the usual nicknames people get given.