Wimbo comes from w- (before-vowels equivalent of u-) and -imba ("to sing").
"To sing" is kuimba.
When making a noun from a verb, the final "-a" is often changed to "-i" (especially for agents), to "-o" (especially for processes) or "-e" (especially for patients).
Correction made. Thanks for the endings really exciting information!
Great! And you're very welcome! :-)