My dad is called by his surname by some of his high school pals and call some of them by surname when he's around them (but not in reference to them if he's talking to me). Thinking back to my high school days in the late 00's I can only remember athletes being called by their last name. Perhaps because of football or sports that you just have your last name on your jersey. It would be an interesting thing to understand more.
I could be regional too. I'm from the US in the midwest.
and Mike.
theres an occasional phenomenon in the US, often referenced in sitcoms, where an individuals entire first and last name sticks as their "nickname"
I learned later that we had a reputation for being a jock school though, because we all had to play a sport each semester.
Also, you made me feel old.
If there's five people named John in the same class in school or the same team at work, it is not uncommon for all John to go by last name.
I'm actually surprised you're not familiar with the practice. Think Scully from X-Files or Stifler from American Pie.
I always assumed it was his first name, thanks for expanding my understanding just a little!
I am still "squirrel" to some college friends. And think of many of my college friends and co-workers as their username.