Why is X.org not suing bird site X.com?
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The name X is not copyrightable as far as I know. There is a lot of stuff named X.
Copyright is different to trademark. Any business name clash would be a trademark dispute
Trademark only matters if there is possible confusion.
The letter x on it's own is not a trademark AFAIK. The distinct style of letter X is what would be the trademark. Because X.com and X.org are two completely different orgs with different brand identities there wouldn't be a problem.
The basic stylization looks pretty similar.
In so far as they are both the letter X. Otherwise they share little similarities.
They both have a bigger line and a smaller line.
And one has a distinctive and large orange loop that clearly differentiates it.