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