I had a friend who did this. I grew up with him when his name was Robert Guy, he changed it to Kenny Langford-Smith when he turned 18. He had 'come out' and wanted to leave the old him behind. It was so hard to remember he had changed his name and for years I kept calling him 'Rob' and he hated it. Amazingly with his name change, he also became a total different person-an egomaniac in my opinion, hence why we are not friends anymore. When he became Kenny Langford-Smith he actually stopped being Robert Guy/. Maybe this shows that names are important in the way we perceive ourselves?