Lex is a distinctive boys' name in United States, ranking #2081 in 2015 with 68 recorded births. The name reached its all-time peak in 2012 with 94 births ranking #1649. Since 1996, the popularity has increased by 223.8%. In 2015, approximately 1 in every 28,180 boys born was named Lex. FALLING Recent data shows the name is currently falling.