Note: This mod only affects on newly spawned weapons and those are in vendors, so weapons in your inventory won't change its name. You need to change it manually.

Note2: Some weapon names based on Khormin's mod, Immersive Weapon Names - Lore Weapons and Ammo mixed with my own opinion. Some weapons didn't have their actual model name mentioned anywhere so I 'guess' its name based on lore to keep it lore-friendly as much as possible. If you think it didn't suited, please leave a suggestion.

I made this mod because I feel like it's so unimmersive that weapons in WSE2 are refer by its model name but weapons in vanilla game refer like a 'generic' weapons despite they have their own name. So I decide to make this mod.

Requirements:
- Fallout 4
- Far Harbor DLC 
- Weaponsmith Extended 2 and its prerequisite mods.

List of changed names:

==========  Pistols  ==========

10mm Gun => Colt N99
A classic pistols that featured in every Fallout game. Colt N99 is common sight in the New California, DC and the Mojave Wasteland but in the Commonwealth, the most common variant of N99 usually come with short barrel instead of long barrel. I have no idea if the short barrel version actually has its own model name but N99 should be fine.

Deliverer => Walter PKK
Nothing needed to explain here. It's obviously a Walter PKK with suppressor.

.44 Revolver => Smith & Wesson Model 29
Like an above. It's obviously Smith & Wesson Model 29, like those in Fallout: New Vegas.

==========  Rifles  ==========

Hunting Rifle => Remington Model 700
Its wooden material, stock, barrel, design. It's obviously Remington Model 700.

Assault Rifle => M2050 Lewis
I believe America in the Fallout universe still do the development on old weaponry despite they're technologically advanced than our real world. So the old gun from Great Britain, Lewis automatic rifle in an American version, M1917 Lewis got its modernized version while back before Resource War on 2052. This gun in Fallout 4 looks very identical to Lewis rifle, featuring its big Lewis style barrel. So it looks like Lewis for me.

Combat Rifle => M1918A5 BAR
Like an above. Combat Rifle looks identical to Automatic Rifle from Fallout: New Vegas and they're actually M1918. I believe those M1918 got further development by US Army after World War II and turned out like this.

Radium Rifle => Volkssturmgewehr 1-5
This gun is an old German rifle from World War II. Although they're modified to shoot radium rounds but they're unofficially modified by Children of Atom personals. So their model name will be remain unchanged.

Gauss Rifle => M70 Gauss Rifle
Based on M72 in Fallout Tactics. These models used by The Railroads looks older and less futuristic than those used by BoS in New California. So yeah.

Lever Action Rifle => Marlin Model 1895
It is a Marlin Model 1895.

Submachine Gun => M1928 Thompson
Classic SMG since Fallout 2. It should be like an old time, eh?

==========  Shotguns  ==========

Double-Barrel Shotgun => Beretta 470
It looks like Beretta 470 without silver receiver. That's all. 

Combat Shotgun => Winchester Model 2100
According to lore, Combat Shotguns manufactured by Winchester on Pre-war era. The model name based on Winchester Model 1200 which is most likely identical to it. There are real world modernized Winchester shotguns called Model 3500 and SXP but they're sounds too modern for Fallout.

==========  Heavy Weapons  ==========

Minigun => Rockwell CZ53
Like in Fallout 3 and New Vegas. These minigun should be CZ53, a personal minigun developed by Rockwell.

Flamer => FT13 Flamerthrower [1.1]
It got FT13 written on its frame.

Missile Launcher => Rockwell M21A4
According to lore, rocket launcher we used since Fallout 1 made by Rockwell and known as 'Big Bazooka'. Although it's based on RPG-7 and PIAT, I think it's rare to find firearms not made in USA being distributed throughout American soil. So I think it might be a modernized version of old M20 Bazooka.

==========  Energy Weapons  ==========

Insititute guns => CIT Defender
This name is based on Khormin's mod, Immersive Weapon Names - Lore Weapons and Ammo. I'm actually out of idea for this and I think his name is nice. But I think his name is redundant so I cut it into this. I should be called "CIT Defender Pistol" or "CIT Defender Rifle", which sound nicer to me.

Laser guns => AEC12
This name also based on Khormin's mod. Laser guns in Fallout 3, New Vegas actually have different model name. For Laser Pistol, it is AEP7 and for Laser Rifle, it is AER9. But in Fallout 4, this gun can be modified into either pistol or rifle so it should be called AEC and "C" stands for "Combined".

Cryolator => Vault-Tec D-XD1
In its concept art, its model name is visible on its receiver.

Plasma guns => REPCONN Urban [1.1]
Just like in Fallout 3 and New Vegas. It should still be this name. Although there is an Institute's variant which has different model name pattern. But it shouldn't be distribute in the Commonwealth. So its name will be like in previous games.

Gatling Laser => AEG3 [1.1]
Judged from its design, It looks like AER9 rifle so I think it developed by the same company. So named it AEG should be fine.

==========  Weapons will be left unchanged (For now)  ==========

Pipe guns, Railway Rifle, Junk Jet, Broadstrider, Gamma Gun, Laser Musket, Syringer
There is no point to change this because they're makeshift firearms made from various stuff.

Harpoon Gun, Flare Gun, Melee Weapons
They sound like everyday items. No need to change their names.

Alien Blaster, Tesla Gun
Out of ideas for this.

F.A.Q.

Q: I don't use WSE2. Does this compatible with vanilla game?
A: I'm now making a vanilla version as an another mod. But for now please use Immersive Weapon Names - Lore Weapons and Ammo instead.

Q: I see there're little (or none for now) name changes on WSE2's weapons. Why bother make it for WSE2?
A: Because vanilla weapons for WSE2 are using keywords from WSE2 prerequisite mods and I made this mod for personal playthough at the first place and just want to share my mod here.

Q: Why ______ named like this? It isn't right.
A: Please suggest your opinion in the comment section. If I see it fit, I will change it.

Credits
- Gambit77 for Weaponsmith Extended 2.
- Khormin for his mod Immersive Weapon Names - Lore Weapons and Ammo for inspiration. I stuck at some weapons that doesn't even have its model name. So I use his mod as example.
- Fallout Wikia and IMFDB for references.