As someone who has worked in creative industries for a decent chunk of my career I would guess that this being an honest mistake is certainly possible.
As a data point I once had to create a whole bunch of placeholder names for coffees (bags of beans) and I mashed together two sets of strings randomly, and one of them turned out moderately racist sounding. I noticed before it was a problem thankfully. 99.9% of the hours you work this doesn't happen, by when you are working 10,000 hours over the course of say, 5 years, weird, improbable occurrences become possible at least once.
And I have totally had tools/apps that spit out the appname as the default filename or export name. I don't know if this applies to this bonobo app, but it doesn't even have to. Someone could have exported a file from the app, and just temporarily named it bonobo because it came from that app (because they don't have a name for it yet), and forwarded it to the next cog (employee) in the chain.
Finally, i'll quote UFC fighter Nick Diaz - "No one know what a gazelle is, this is America."
I think it's less likely, but still possible, that it was actively named bonobo without knowing the definition. I'm not sure I even knew what a bonobo was until my mid-twenties and I believe it was solidified in my mind when I googled the band of the same name. Yes, maybe I'm stupid, but game development is a young industry and not everyone working there is going to be a genius. It's possible they just had a pile/array of cool sounding names that they pull from, and the vowel/consonant combination sounded African to them. Maybe this could be some sort of subconscious racism at most.
Active racism is a possibility, but I think it's so unlikely, and to prove this as being true you would have to get in a time machine and scout out the scene with a miniature invisible drone, and even then you probably won't be able to prove it.
