It seems that Ryu Hayabusa, of Ninja Gaiden fame, had a father called Joe Hayabusa.
And we all know the titular Shinobi of Sega's franchise is named Joe Musashi.
Then there were Joe and Mac, caveman ninjas.
OK, so that's three. But the question still remains. 'Joe' seems to be too biblical of origin for shogun or Neo Zeed-controlled Japan, so what gives?