Something was posted over in
[REQ/CSGO]Player name changer basted on SteamID, however, it uses MySQL database to store names and is tied with the OP's own database structure.
It shouldn't be that hard to change it to something matching your MySQL database structure (if you have a database with the information already), or something that is connected with e.g. your website's forum board (if you run a such one).
If you run any of the player trackers out there, that saves the first name the user ever used in one of the columns of the player tracker database, the SQL query could simply be changed to SELECT directly from that column and it would do almost exactly what you want.
One caveat with this one is that you do not have the 60 seconds to change your name as the one you link to, once the database has a name, that name (or any future adjustments to the name directly in the database) will be the one that will be forced.