SeemsLegit, that is one handsome boy!
Here's a story to tie into whether a name is recognized by a horse vs the person calling the horse being the key.
So, we got our horse at a broker's. When we looked at him, we asked what his barn name was. The broker said he didn't know and said called all the horses at his place 'Horse'. I asked him to find out his barn name when we decided to take our trainer to look at him with us.
On our return visit, the broker said the horse's name was Chuck. When I went out to his pasture to get him, I called his name and there was absolutely NO response. I happened to bring a treat with me and went up to Chuck calling his name and fed him the treat.
Even after our ride with the trainer, and the subsequent vet check (since we decided to buy him pending the results), Chuck still didn't recognize his name.
It really took about a week or so after we got him to the barn we boarded at for him to respond to Chuck.
Maybe if I had known what his real barn name was, we would have kept it. Since that obviously wasn't an option, we went with Chuck... Over the last 6 years, we've had a good time playing with that name; Chucky Cheese, Chuck Roast, etc.