Jean-Baptiste Denys was a French doctor who performed the first human blood transfusion in the 18th century. In contrast, Denys Baptiste is a London jazz man. His last album was 2010's Identity By Subtraction, A-positive if you want my opinion. So the main difference is that one was French and the other wasn't. Here's the album.
Denys Baptiste - Identity By Subtraction by dunemusic
