MediaWiki:Titleblacklist-forbidden-new-account

The user name "$2" has been blocked from creation.It matches the following blacklist entry:. Please use a real name for the user name. User names need to be comprised of only alphanumeric characters (no signs).

E.g.: User name creation (and article creation) blocking rules are controlled by MediaWiki:Titleblacklist and MediaWiki:Titlewhitelist.
 * "Mary Smith". OK.
 * "MarySmith". OK
 * "Mary smith". OK.
 * "marysmith123". Invalid.