Meaning and name origin
Janus \j(a)-nus\ as a boy's name is of Latin origin, and the meaning of Janus is "gateway". 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.
Janus is not a popular first name for males but a very popular surname or last name for all people (#16487 out of 88799, Top 19%) (2000 U.S. Census).
Displayed below is a comparison of the popularity of the boy name Janus and its variant forms. The only popular variation form ranked in the Top 1000/100 is Gennaro. (2014 statistics).
Janus is also 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.