The X.500 series Common Name is a weird thing to fixate on here. It's an arbitrary free text "name". The only reason it's even sometimes useful in the modern era is that the CAB BRs say it has to match one of the SANs so it will probably be a DNS name. But even there good luck, it took until 2016 or so to get the last stragglers to obey that rule properly without "misunderstanding" it and unlike SANs it isn't defined to be DNS A-labels so it may have arbitrary Unicode text.

Most browsers stopped even looking at CN or only do so for people's crappy home grown private CAs

Anyway, what makes certs trustworthy isn't the CN, it's a chain of two or more digital signatures leading to a trusted root. And the CN in that root, while it had to be truthful when written, may be twenty years old, so it's nonsense now.