radianites ou kingdom points for exchangeable points for my tournament

Hello everyone ! I would like to know if i can use the name of "radianites" and/or "kingdom points" for exchangeables points in my tournament ? It would be something that player earn by playing some matches and that they can exchange for avantages in game. That has nothing to do with it real money or something that they can exchange for real rewards.

Thx for your help and have a good day !