In the 1950's, there was a character actor who got into the business and put together a nice body of work both in films and in the burgeoning television medium. His stage name was Richard "Dick" Shannon and if you look in places like www.imdb.com, and search on his name, you can see what I am talking about. He disappeared from the performing business when he and his family of young children relocated away from southern California to pursue a more family-friendly way of life; he has been dead for some time.

His name at birth is given as Richard Esberry Mangan. James Clarence Mangan, as far as I have learned, never sired children and had no direct descendants. The poet did, however, have blood relatives and the actor known as Richard Shannon is said to be descended from these.