I have a question about the potential rename of one of my characters.

The situation is this: I made a character several years ago with a specific name. Later, the naming policy was changed and now I can't make a character with this name. For those interested the name is a lore-related name, the name of a minor river in middle earth.

So now, I am looking at transferring my characters, i've been waiting for transfers to come back up for this reason, but my concern is that my character will get force renamed due to having a non-allowed name. Will my character's name be safe? or will I either have to leave them behind so they don't get renamed, or just put up with the force rename that I don't want?