Well, a little Googling certainly shows that Kioko is indeed a real Kenyan name. For example, the director of the Kenyan Bureau of Standards is Kioko Mangeli.
To find the original meaning, you will have to consult persons who are familiar with Kenyan languages. Your best bet is to find a person or book that will tell you about Gikuyu, the language of the Kikuyu ethnic group, by far the largest single ethnic group in Kenya.
Because this message is archived you cannot respond to it.