Mw13, I heard #3.
I was in a shul once when a Shira’s name was changed, based on R’ Chaim’s say so. The rav of the shul was asked if they should follow. He asked R’ Dovid Feinstein, who said to listen to R’ Chaim.
So I would suggest to anyone whose name is Shira and wants to keep it, not to tell it to R’ Chaim.
Similarly, many clean shaven men go to R’ Chaim only after not shaving for several days, so he shouldn’t tell them to grow a beard, and men with payos behind their ears take them out. I would probably take off my wristwatch as well.
The name Chaim is in Rishonim, by the way.