What does Sagan mean?
Sagan is a rare given name for men but a very popular last name for all people (#21335 out of 150436, Top 14%). (2000 U.S. Census)
Shown below is an analysis of the popularity of the boy name Sagan and associated names. Sage (#654 the previous year) is the only popular varying form of Sagan (#unlisted) appearing in the Top 1000. These boy names reached the apex of their popularity in 1997 (usage of 0.501%) and have become significantly less popular since (usage 0.346%, down 30.9%). Sage (#654) is the most chic boy name among these. (2014 Birth Statistics)