User blog comment:Kaido King of the Beasts/Chapter 802: The Elephant in the Room/@comment-4493594-20151001133320/@comment-27.34.22.239-20151001140712

you're on to something. A few days ago, I saw a prediction in this wiki, where Nami randomly ate a devil fruit. This could very well happen. So maybe, zo is where zoan devil fruits are in abundance or originate. That would explain the minkwoman and also why kaido's crew was there. Since, they're 500 zoan strong, that could probably mean they'd go for more. Personally, I like this theory. Zo people are called Zoans.