Moderators have had an interal list of username changes for years. It's not public since some users change names to avoid being associated for instance with a host they worked with. That is why we have started this thread where people if they want to can list their previous username.
You can request a username change by contacting an administrator (Peo or Jan). We limit how often you can change a username to 12 months to avoid too much confusion for other members.
Discussion of username changes is ok in this thread.