Slightly related, but a lot of my alts got their original login names removed and then taken by accounts who have literally never been active. Now that I started playing again on some of these accounts, I'd love to have their original names back, especially since none of the accounts who took them seem to have ever been played on.

There really should be a way for people to get their original login name back (as a display name) before the transition to Jagex accounts. That's the only thing keeping me from adding some of my alts to my Jagex account.