JM 1 & 4: Justin McCarthy (1830-1912) and his son Justin Huntly McCarthy (1860-1939) were both MPs of the Irish Nationalist Party, and are easily confused.A History of Our Own Times is by Justin McCarthy 1830-1912. The situation is made even more complicated by the fact that the son later edited some of his father's writings, so some works should bear both names.
.JM #3 - Father Justin McCarthy, author of the Brother Juniper cartoons
#5 Justin McCarthy, Australian historian.
#6 Justin McCarthy, born 1947, poet.