@Abbey listed a 12th zebra named ‘Crossing’, so her account of three groupings of 3.0, 4.0 and 1.4 ties in well with the list you’ve researched.
The herd of 1.4 would be Gogo, Kioni, Kijani, Imivimbo and Mara. There’s no foals yet because of transferring in the new stallion.
The herds of 3.0 and 4.0 would then be comprised of the following seven males: Kwasi, Mstari, Marzuka, Khari, Runanko, Zuri, and Crossing (with Kwasi and Mstari in the trio, along with a third male from that list).
Gogo and Crossing are indeed unusual names. Gogo is a name originating from Zambia that means ‘grandmother.’ My guess is the colt was identified as a future breeding stallion from birth and using an online translator or similar to find a name referencing him as an ancestor of many/grandparent, they came up with that. Either that, or he was mis-sexed as zebra foals often are. Crossing of course references the zebra crossing, but thwarts attempts to research the origins of this zebra via a search engine.