I found "Wangari" to mean "leopard" in enough places (not only questionable "baby names" websites) that I would trust this meaning, e.g. here (although in
German):
https://de.wikipedia.org/wiki/Kikuyu_(Ethnie)
Interestingly that page gives a meaning of "female singer" for "Wambui", and not "zebra".
Edit: Just found this:
"This name translated literally means 'of stripes' that is why the zebra in Kikuyu is called wambui micore (pronounced mishoore). So, it is thought that the name Wambui is derived from some name-link association with the zebra."
http://www.babynology.com/meaning-wambui-f37.html
That zebra is not simply "wambui", but indeed "wambui micore" can be seen on pages like the following one:
http://hubpages.com/education/The-Kikuyu-LanguageThis message was edited 3/19/2016, 9:55 AM