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It seems clear from a little Googlin that Mumia (or, more fully, Nabongo Mumia), was the name of the last king of Wanga, the chief home of the Luhya people of what is now western Kenya, just before the British arrived and tricked him into signing a treaty giving them control of the area. So Mumia was the name of a particular leader of the Luhya people back in the 19th century. You would have to find someone who knows the Luhya language to find out if Mumia has a generally accepted meaning. The first two online Kiswahili-English dictionaries I consulted did not contain "mumia" as a Swahili word, so it's more likely from the Luhya language.