You are incorrectly assuming only 3 people can claim a name lmfao. Just stopI just want to remind everyone, because it's easy to forget, that the name you're attempting to claim as your own belongs to up to two other people, each of which is just as deserving of that name as you are. If one of your dopplegangers manages to keep their name, it doesn't mean they stole it from you. The fact that your name got a server tag means that you'd likely be racing at least one other person, possibly two, to get that name.
In short, please don't harass the one who won that race in-game, or call them a thief. They were merely protecting their own name, same as you.