What does Sixtus mean?
Sixtus /six-tus/ [2 sylls.] as a boys' name is of Latin origin, and the meaning of Sixtus is "sixth". See Sextus.
How popular is Sixtus?
Sixtus is an uncommonly occurring first name for males and also an uncommon surname for both adults and children. (2000 U.S. Census)
The only prominent related form of Sixtus (not ranked) ranked in the Top 1000 is Sixto. This boy name reached the height of its popularity during 1940-1949 (usage of 0.054%) and is now less popular. Below is a graphed comparison of the usage of Sixtus and related names. (2014 Birth Statistics)