It’s really weird to consider that Gil and Tarvek, based on other examples of them speaking like English prep school kids, could have called each other exclusively by their last names even when they were small children on really good terms.
I want to believe this, but: even Gil didn’t seem to know his own surname when he and Tarvek were friends as kids. So I propose that Gil called Tarvek “Sturmvoraus” all pompous-like, but Tarvek was just like “Hey Gil!” in some of the most hilarious exchanges two tiny children can have.
Cheloneuniverse 