[Potatoman]

As far as I can tell from googling, Hara-Kiri is an english construction of the words Abdomen (hara) and the verb to cut (kiri) which has become prevalent pretty much everywhere. Hara-Kiri and Seuppuku both refer to the same ritual suicide ceremony, often dual-listed together under the same heading in a dictionary.

Regardless, I'm not attempting strict historical accuracy. None of the standard Dominions races are made to flawlessly represent ancient civilizations, and I'm not trying for perfection in that regard either. The O-Ban great guard, for example, were created after the unification but are recruitable units in the mod. Likewise Tengu, Oni and Yurei are only myths and their inclusion would be historicaly inaccurate, yet they are summonable.