I had the same thing happen to me about ten years ago. The name
Katherine /
Catherine would pop into my mind every once and a while. I wondered if I was being haunted, or going crazy.
Seriously, I don't think I would have used the name, though. There are others that feel more like they would be my child's name. It doesn't pop into my head anymore, so if I were you I'd stick to your prefered style (
Lazarus,
Balthazar, etc.)
Love Balthazar, by the way.