In terms of Parentlock I have too many gifsets/photos/Asa Butterfield stuff to change my headcanon of Hamish Watson-Holmes. It happened that a couple of days ago I was thinking of how I got my name, a spur of the moment at the registry place by my dad. So I was thinking that John could task Sherlock with the registering of the kid’s name, suggesting something simple like Luke or Mike, but at the office Sherlock decides to name him Hamish. It could be that he just wants John to be happy with every part of himself, or that he just wants to piss him off. I don’t know. But I do agree that John would never willingly call him Hamish, thus my new headcanon.