Ok I'll bite.
Bokken - Same Stats as a Katana except S rather then P and can be used with Blades instead of Clubs.)
Katana- It's already done bro!
Wakizashi- It's a sword, 'cause it's smaller then a katana and bigger then bread knife!
Tanto-Combat Knife OG
Nodachi- ye olde Claymore
Naginata- Polearm (Cause who doesn't love really big sticks with blades on the end?)
Bo/Jo Staves- They're Staves Son, says it right in the name!
Now we get into more esoteric
Nunchaku It's really a flail, but as we don't have stats for one in 5th. next best thing is a Telescoping staff, it has good reach for being a fancy club.
kasuri gama- It's both a chain and a Cougar fine blade (Long). I'd assign it an exotic weapon skill, as it's two weapons in one, pick which one you want to use and roll away.
Tonfa- Extendable baton, i'd give a bonus to parry but i guess that's not allowed?
Sai- All the examples I've seen are not sharp, so to me these are fancy parrying clubs, so I'm gonna go with Extendable baton. If it they were sharpened, Couger Fine blade (Short), again something i would give a die bonus to parry.
Kama- Cougar fine Blade (Long), when used like they were intended, they should really have a longer reach, but life is not perfect.
Tetsubo- Combat Axe