My guess is 7 weapons have unique weapon-magic, 50 have a generic spell including bare fists for a grand total of 57 different weapons? I never leveled all the weapons up that far so I'm going from a memory of hearing Renwick say that every melee weapon in the game had a spell at level 3 . . .
Ancient Sword
Bastard Sword x2
Battle Hammer
Battle Sword
* Black Scar
Broad Sword x2
Broken Sword
Crescent Axe x2
* Crystalline Blade
* Dark Defiler
Darkwood Club
Dwarven Pickaxe
Dwarven Sword
Earth Binder
Earth Carver
* Earthquake
Fiery Sword
Fire Carver
Forest Carver
Frostbite
Great Sword
Hammer of Woe
Hand Axe x2
Holy Crest
Knight Sword x3
Lawful Blade
Lethal Rapier
Long Sword x2
* Moonlight Sword
Morning Star x3
Pickaxe
Queens Staff
Rapier x2
Scorpion
Short Sword x2
* Triple Fang
* Tsunami
Venom blade
War Hammer
War Sword
Water Carver
Water Carver
Wavecrasher
Wind Carver
Windslayer
Wooden club
or maybe not. . . who knows