Hi,
when i was creating my account on twitch, i was going to use Godsuo, what is my official stream nickname,
but it was already taken. But actually I think, user of that acc Godsuo is not using that one anymore and i used imgodsuo… but ofc i want have my normal nick in URL and twitch at all… twitch.tv/imgodsuo (now) -> twitch.tv/Godsuo.
Your best bet would be to check out their blog on name changes - read through it and follow the steps, and if you are able to change your name, that process will allow it (assuming name is available).