Martin Luther King, Jr's original first name was Michael, and he changed it when he was in 6th grade. (I'm not sure whether it was Michael Luther King or just Michael King.) Was his father's first name Martin or Michael?
The name of MLK's father was Martin Luther King, Sr. - see:
http://www.stanford.edu/group/King/about_king/
Regards,
Ryan Shepard
(The Nobel Prize website confirms that MLK was born Michael Luther King and that he had his name changed to Martin later. The Gale Group also has a biography that mentions both that MLK's original name was Michael and that his father was Martin Luther King senior. -- KK)