Zef is a distinctive boys' name in United States, ranking #12117 in 2013 with 6 recorded births. This places Zef in the bottom 14% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2000 with 6 births ranking #10341. In 2013, approximately 1 in every 315,209 boys born was named Zef. FALLING Recent data shows the name is currently falling.