Lex is a distinctive boys' name in United States, ranking #1749 in 2008 with 87 recorded births. The name reached its all-time peak in 2012 with 94 births ranking #1649. Since 1996, the popularity has increased by 314.3%. In 2008, approximately 1 in every 23,448 boys born was named Lex. FALLING Recent data shows the name is currently falling.