What does Dionysios mean?
Dionysios is an unusual given name for men. Dionysios is also an unusual surname for both adults and children. (2000 U.S. Census)
Below is a graphed analysis of the usage of the boy name Dionysios and affiliated names. Dionisio and Dion are the prominent alternative forms of Dionysios (#unlisted) appearing in the Top 1000. Adoption of these boy names reached its highest during 1970-1979 and has become much lower since, with the version Dion becoming less in vogue. (2014 Birth Statistics)