I have changed user names lots of times in the past 14 years. Other peoples, not mine. Because they were inappropriate. On an eastern hemisphere based international computer security product forum.
My nick is the same in several fora, and I have not had the desire to change it.
There is a website for a non-profit advocacy entity where I use my real name when I post reader comments.
What I would change my username to right now is easy: x-raccoon city.
In the last week I have had to "relocate" 5 of those nasty bandits because of them destroying all of our eggs as soon as they were laid. Someone told me I had a raccoon city here. So I said no he's a BLF member and he is not from around here. I got a strange look because they didn't have a clue about the REAL raccoon city here.
BTW - the eggs are painted turtle eggs buried in the ground. 5 or 6 nest have been destroyed this year already.