There is a name that doesn't exist on RS3 or OSRS in either high scores. And I would really like to have the name. It would be my first name change. The name is (Shanesshaner). It's my stream name so I was curious if it were possible to be freed up so i could use it.
The name is taken by another player. The way you can tell is by adding the name to the your friends list. If it wasn't taken, it would say you were "unable to add friend - unknown player". However, this name does appear when you attempt to add it, that means it's the name of a real account.
There are two possibilities as to why it's not showing up on the high scores. The first possibility is that the account could be permanently banned. A permanently banned account will show up on your friends list but not on the high scores. The second possibility is that the stats could all be extremely low, possibly even completely untrained. Nevertheless, the name is still taken and likely won't ever be made available. I'm sorry
That's actually not the case. Banned accounts names aren't freed up. Name wipes are usually automated and banned accounts don't fall under the necessary criteria. I believe this is to ensure that those banned aren't able to recover their username in the future, but I could be wrong.
You can read up more here: https://support.runescape.com/hc/en-gb/articles/115001761889-Unavailable-character-names