Using Japanese letters in the username
12907
What characters are allowed for the display name?
110488
Special (non-english) character in name. What to do as author? Internationalize or not?
36600
How to make the Java.awt.Robot type unicode characters? (Is it possible?)
20114
Why are usernames allowed to be composed entirely of non-visible Unicode characters?
134993
My name includes space - How do I enter my username when typing command?
106006
Special characters
129226
Period character used for local computer name
45300
How to prevent duplicate usernames when people register?
20778
Comment submission broken for comments that end with @username
86885
Why do some users have username "user########"?
9427
What is correct form of writing: "users names" or "user names"?
72668
Dealing with "difficult" usernames in targeted comments
61074
How to retrieve the user name from the user ID
71580
Change default username from "Unknown" to "User{number}"
51375
Why would one limit username format?
79792
What characters allowed in file names on Android?
21165
Escaping username characters in basic auth URLs