Basically do a brainstorm of generic single words that go well with "gaming" and that don't limit you to anything.
Examples (no idea if they are already taken):
Phoenix gaming
Viking gaming
Zeus gaming
Jaguar gaming
There are lots of online tools that can help you. They are mainly used for choosing domain names for websites, but you can use them for YouTube channels also.
Here are some name generators that can help:
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I'd also advise you to check if the social media accounts and domain names are also available.
Good luck.
