Tsiron's current weapon glam, the Ravel Keeper's Blade, is clearly based on what's known as a Shashka, while another one I homed in on but ended up not liking as much, the Crystarium Samurai Blade, would best be described as a Swiss Sabre? So they're not entirely averse to referencing non-japanese weaponry, and that's good! It's a (debatably) fantasy game while our character wanders all over, so it's not unreasonable they'd pick up some more unorthodox weapons along the way despite ostensibly being a "samurai", y'know?