Ubuntu: Where do they get those names?

Since I speak a little ChiKaranga, I know that Ubuntu means people in Swahili.

And I use "Feisty fawn".

But now there is Gutsy Gibbon

And coming soon: Hardy Heron...

Making one geek ask: What about Indignent Iguana?

And Ubutugeek has a page instructing you how to surf the web anonymously...