Do I have to pay another 10$ to change the Xbox gamer tag

If you have 2 names, then you have 2 gamertags, not a display name. One is a classic gamertag and one is the tag that follows the newer gamertag policy. That'll typically happen if you change your tag to something that is not available with the old system so it keeps both in order to use the old tag in areas that don't work with the new system.

Yes, you would have to pay again if you want to change your name again.

So I’d have to pay a total of 20 for no reason. Kinda dumb you should be able to change both your display name and Xbox gamer tag at the same time

unfortunately, if you want your gamer tag changed you will have to pay $10 to change your gamer tag.

U WILL have to pay for a new gamer tag. Change is 10$ sorry. GL...