What does Lief mean?
Lief is an uncommonly occurring first name for men but a very prominent surname for both adults and children (#54766 out of 150436, Top 36%). (2000 U.S. Census)
The only prominent variation form of Lief (#unlisted) is Leif (#998 the previous year). Adoption of these boy names reached its most widespread during 1980-1989 (usage of 0.224%) and is now significantly lower (usage 0.002%, down 99.1%), with Leif becoming less trendy. Below is a charted comparison of the popularity of the boy name Lief and corresponding names. (Top 1000 Birth Names Records, 2014)