Weapons are sized proportionally to their initial wielders

A goblin will swing a “shortsword” that deals 1d4 damage. Looting their corpse, you find that the sword is actually just a Bowie knife.

A giant of some variety will swing a versatile sword with both hands, doing 2d10 damage. A human cannot use it one-handed, only two-handed. It is described by other NPCs as a “Horsekiller.”