What does Janus mean?
Janus was the Roman guardian of doors as well as of beginnings and endings. He had two faces, one of which looked forward and the other backward, and gave his name to the first month of the year, January. A Saint Januarius was martyred in the fourth century AD.
How popular is Janus?
Janus is an uncommonly occurring given name for men but a very prominent surname for both adults and children (#13220 out of 150436, Top 9%). (2000 U.S. Census)
Displayed below is an analysis of the usage of the boy name Janus and corresponding names. The only prominent alternative form of Janus (not ranked) appearing in the Top 1000 is Gennaro. Adoption of this boy name was at its apex during the years 1900-1909 (usage of 0.098%) and is now less. (2014 Birth Statistics)
Janus is pronounced similarly to Janos, Jonas▲ and Junius▼. Other suggested similar baby names are James, Janak, Jancsi, Janek, Janesh, Janko, Janse, Jens, Jones▼ and Manus. These names tend to be more commonly used than Janus.