Stack Overflow username policy
30033
What are the rules governing display names and avatars?
153733
How do you give people prefixes for their usernames?
18263
Shouldn't the Terms of Service use Stack Overflow, Inc.?
58071
How to safely change username and hostname?
62082
Log In With Stack Exchange. Why was this added?
1598
What's the policy about having multiple user accounts?
126983
email field or username for logging in an application?
84516
Getting the real name of an user
126309
How do you post to Stack Overflow without fear of being judged?
45016
Allow registered users to hide username when asking privacy-sensitive question
81510
Does registering [name]overflow.com violate Stack Overflow's trademark?
13235
How does a new user begin using Stack Overflow/Stack Exchange?
19126
Old usernames stick to Community Wiki posts
111288
Are there any chat rules on Stack Overflow?
8807
How do I change my username?
12907
What characters are allowed for the display name?
136282
What characters should I use or not use in usernames on Linux?