I tried to keep my initials at first, but the name I picked initially (lol) just didn't fit me well. I dug Sebastien, and I've stuck with it. There was a period of time when I thought I'd give my mother a chance to choose my first name, but after giving her about 10 opportunities to do so and being brutally rebuffed every time, I decided against that. So... my initials went from RCB to SDB. I won't reveal my birth name, because I abhor it.
In the end, it came down to meanings over letters/initials.
SD