I made a little thread about the name puns on Twitter like two years ago, but feel like it needs a proper post on Kanzenshuu, since it's not really known information (also hasn't been confirmed yet, just putting things together which make sense
So, in the December 2013 VJUMP issue we learned not only about Toyotarou's birthday, but also that he is from Tochigi Prefecture (about 2 hours by train from Tokyo).

Why is that important? Well, many name puns of Moro and his henchmen seemingly have a connection Toyotaro's local area Tochigi, which is very interesting, since the Galactic Patrol Prisoner arc was seemingly "Toyotaro's own arc" (with Toriyama in a more consulting position).

First, the most obvious:
Moro and Saganbo
Both "Moro" and "Saganbo" refer to shark meat in local Tochigi dialect. Maybe also worth to know that Tochigi has no connection to the sea, so they get the meat from the fishing in Miyagi.
Miza, Iwaza and Kikaza (the three girls who later fuse)
Their names refer to the "three wise monkeys" (see no evil, hear no evil, speak no evil) - which originates from a carving in the famous Tosho-gu shrine in Nikko, which is a famous touristic place in Tochigi Prefecture.
Shimorekka (the one which looks a bit similar to Beelzebub from "Sandland")
Probably based on "Shimotsukare" (しもつかれ), which is a dish in the Northern Kanto area and mainly served in Tochigi. It's made of salmon head, vegetables, soybeans, abura-age (or deep fried tofu skins) and sake kasu (酒粕, literally rice pulp from fermented sake).
Yunba (the bear-looking one)
The name is likely based on "Yuba", which is a food made from the tofu skin that forms of soy milk when it gets heated.
Which is again, famous in Tochigi and seemingly especially in Nikko.
Zauyogi (the guy who fought with Yamcha)
Of course, on the first look, his name is just based on Gyoza, which you get all around Japan. However, if you ask Japanese people for famous Gyoza regions you often hear the city "Utsunomiya" in Tochigi Prefecture. There's even an annual Gyoza festival and a Gyoza street.
For the other characters, some have a slight, but seemingly a way lower connection to Tochigi:
Yuzun is based on Yuzu (a citrus fruit), probably to fit the name puns of Zarbon's race. There was also a character called Yuzu in the game Geikishin Freeza with the same pun source. Yuzu is also harvested in Tochigi, much like in many other regions of Japan, so I wouldn't go as far as calling it a Tochigi-based pun, but the connection is still there though.
Bikkura Quoitur comes from びっくらこいた, which is "I'm surprised" in Hokkaido dialect, but seemingly also used elsewhere in North East Japan. Maybe a stretch to connect this one for Tochigi as well. For Seven-Three, I don't really see anything though, maybe road number in Utsunomiya
Edit: more about Seven-Three in post below.
Anyway, I hope you found this interesting and I'm curious about your thoughts.
Maybe there are even more connections in the arc I haven't noticed yet, so feel free to share that as well as I find this an interesting topic.
Thanks for reading