Do any of you perform under a nickname or an assumed/stage name?

Did you choose your name, was it given by a friend or relative, was it given by an agent/manager/promoter, or did listeners/admirers start calling you something other than your given name?

It was easy back in the day... "Blind So-and-So", because, well, you're blind.
"Big Mama" Thornton - a robust specimen, to be sure.

If you do use a different name, is it a nickname like "The Boss" or is it a nom de plume, so to speak, like Robert "Bob Dylan" Zimmerman?