Well,

And if there was, wouldn't that be a little off tradition and such.

Yes.

Handeness is a matter of genetics not tradition. So technically there were left handed Samurai, but to a man they were also ambidextrous and wore and used their swords just like everyone else.

I had heard a rumor that Musashi was left handed. No proof for it, though. Anyone else here got info on that? Hyaku?

By a matter of genetics, yes. However, most knights of any era trained enough to be at least moderately ambidexterous.

If you are a fellow southpaw thinking about supporting a request to learn kenjitsu or Iaido left handed, forget it. Today's Japanese schools stress tradition too much (especially Iaido), and the righties' main objection is simple and seemingly straightforward: the instructor can't show you exactly what to do because it's backwards.

Now, we lefties understand that, for us, mirroring actions is as natural as doing them straight. However, I've argued that before with Charles, and gotten nowhere. So, my advice: come over to the light. Start fencing.