Swahili is only really spoken in the far east of both DRC and CAR, whereas WLG's natural distribution doesn't actually cross over with Swahili speaking parts of either.
I don't know the percentage of CAR speakers, but DRC has less than 10% speak Swahili, and its status as an official language only really comes down to their membership of the East African Community.
Swahili is nearly spoken in the territories of Mountain Gorillas and Grauer's/ Eastern lowland gorillas (which funnily also lIve at altitude

)
I love Swahili names and had a hunch it came down to a tradition, but I do think the choice not particularly appropriate. Especially as it would free up more names for other plains based species.
I do quite enjoy that most names, even if not Swahili tend to start with K