Rav Chaim comments on any number of things, according to the parsha sheet named after him this past shabbos. Short sleeves, shaved beards, writing or emblems on clothing, and names. He may be a daas yachid in some of these items, or following minhag chazon ish. It underscores the importance of having your own rov.
And as an aside, anyone who does change their name has to update their kesuba too, which is more challenging.