Now I wonder how many name weapons in RPGs?
I have done so, when there's a good story behind it.
In a live-action campaign I played in, there was a tradition of players making props, for themselves and each other. I was playing a mechanic/savant engineer (named Cody) from a post-apocalyptic version of the American midwest (fondly referred to as "the P-Poc"). The game supported live melee-combat (with boffer weapons), airsoft firearms combat, and theater-style combat.
I normally played on the theater side of things. In the first event of the campaign, we had a "get to know each other and create a backstory" scene from everyone from the P-Poc, which was, in essence, a (theater-style) barroom brawl. At the start of the fight, I reached into my toolbox, because I had a big honkin' wrench in there as a prop that would also do as a melee weapon. Theater style combat is kind of slow sometimes, so for a little while I'm standing there holding the wrench over my head, frozen in miming whalloping a Bad Guy with it. The GM running the scene says, "Okay, so Cody has a big-ass hammer, and he's going to brain this guy with it." And someone notes to the GM that what I'm holding is a wrench. Another guy notes, humorously, that as a GM, what he'd said must be reality. A third then piped up that, in order to be consistent, the fact is that this must be the wrench Cody normally uses in combat, and everyone calls it "Asshammer". And thus the weapon was named. Someone, just for kicks, made me a huge pipe-wrench boffer weapon for cases when I was going into such combats, so I could still use Asshammer.
I then realized that, while I had some skill in firearms combat, I didn't have a prop for it. All the game's gun-bunnies just used their airsoft weapons as props when in theater-style scenes, but I didn't have one. I took a Nerf gun, made some modifications and gave it a nice paint job, spent a bit of time to apply my Engineering expertise to improve it's game stats. It was kind of huge compared to the airsoft handguns, but I was okay with that, as ti was supposed to represent the biggest and best handgun Cody could make. When I first drew it in (another theater-style) combat, the GM running it hadn't read the memo on my weapon, and asked, "What the hell is that?!? A cannon?" And thus was named "Cody's Cannon".
Later in that game, when the character had gained some crafting magic, he bound a (willing) thunder-spirit to another weapon for when he needed a boost in combat with magical entities, and this one was dubbed, "the Thundergun".
The ironic thing was that, in making the character I had originally gone for function first, and worried about background afterwards. So, when character submissions were coming due, I was a bit rushed. Just so I had a plot that I knew would hold together, I took King Arthur, and filed the serial numbers off. Nobody knew this, but still somehow the guy with the King Arthur story is the one who ended up with named weapons.