This is a sociological phenomenon not limited to africa. When someone reaches celebrity status, very often that person's name ends up being used by parents from the geogrphic location where said celebrity hails. It could be a display of admiration or - like so many americans copying the names of celebrity babies - the trendy thing to do. Either way, a generation later, you see an influx of adults with names of former celebrities.
For those that missed it, this is intended to be a lighthearted, semi-sarcastic response...