It's been discussed before, and general concensus is that swords in Fallout are a bad idea. Think about it - how would a sword come to exist in a post-apocalyptic wasteland? Who would make it? A blacksmith? Nah, blacksmiths don't exist anymore. A metalworker? Perhaps, but where would a metalworker learn to manufacture a good, balanced sword? Correct me if I'm wrong, but swords have kind of fallen out of use in the past several centuries, so chances of finding someone capable of forging a sword in the post-nuclear wasteland are negligible at best. A metalworker might be able to fashion an axe, a knife, a saw, a pipe or even a simple gun, but a sword? Nah.
Alright, suppose there is a metalworker somewhere in the wasteland who for some reason has mastered the long-forgotten skill of forging an obsolete weapon. But then another question must be asked - why on Earth would anyone in the post-apocalyptic wasteland want to wield a sword? I mean, one would have no way of learning even the basics of fencing except from personal experience, which means his starting skill would be -20 at best. Furthermore, what can one do with a sword? Slay a bunch of raiders? If we go with the assumption that shotgun-wielding raiders will stand around not shooting while a screaming moron with a bladed weapon is charging at them, then yeah, a sword sound like a good combat weapon. But if we take into account that the player's enemies normally have an IQ higher than 80 and that even those who prefer melee weapons pose a much greater threat to the player with their knives / hammers / spears than the player with his -20 swordsmanship skill does to them, the conclusion is inevitable: sword is a weapon only suited for combat, and even there it's inferior to other melee weapons because it is wielded by inept hands. A sword doesn't chop wood, skin animals, sharpen sticks, hammer nails or break down doors. In other words, a sword is useless in all non-combat applications and any sane adventurer would carry an axe, hammer, crowbar or knife instead.
P.S. Wazakashi and katana would be so hopelessly out of place in the Fallout setting that they would make even Monty Python references seem canonic.