surprised you found nothing on the quizmail forum. I decided to look and viewing all the messages found the following clue for q 135 gibe on Tues Jan 16
"Hi All.I think this boxer was born W(M)J. boxed under (M)J.then as H A.aka H H.the (M)could be a tune"
I imagine somewhere like wikipedia will have list of boxers look for boxer with initials MJ or HA