I wouldn’t look too deep into this. Otherwise think of how many would sue for their name, it’s been made pretty clear idols like Yamazaki Mei and Yamazaki Yuhane aren’t related, and yet maybe somewhere in the world there is another person with the exact same name, like Yuhane could have a third cousin named Yamazaki Mei but it wouldn’t be documented.
And generally speaking the world, names like Matthew Smith is also very common if one Matt sues, it would bring about a lot of issues.