Odd that I asked this just after it was already posted on this board. My apologies! I honestly didn't even see it before. Damn this cold I have!!!! So sorry...
I don't have to worry about mine being taken since its fairly unique and its gaelic for banshee. I liked the sound of the word and it stuck with me (very similar pronunciation to cognac.) I also picked it at a time of my life when everyone seemed to be dying on me and well, banshees tend to proceed death so it fit. I am not nearly so pessimistic now but it is sort of a reminder to live my life since you never know how long you have.
Mine is the initials of an old Tommy Dorsey song, I'm Getting Sentimental Over You, which probably only trombone players would recognize in initial form.