William Harrison Dempsey is a name that may not be familiar to many people. However, there are several other names that can be used as synonyms for this person's name. For instance, William Dempsey, Jack Dempsey, and the Manassa Mauler are popular names that refer to the same person. These names are used interchangeably to describe the US heavyweight boxing champion who held the title from 1919 to 1926 and remains one of the most iconic fighters of all time. William Dempsey was known for his aggressive fighting style, fierce determination, and his ability to take down his opponents in the ring. Whether you refer to him as William Dempsey or Jack Dempsey, his legacy as a boxing legend lives on.