Lex is a distinctive boys' name in United States, ranking #1613 in 2006 with 90 recorded births. The name reached its all-time peak in 2012 with 94 births ranking #1649. Since 1996, the popularity has increased by 328.6%. In 2006, approximately 1 in every 22,835 boys born was named Lex. FALLING Recent data shows the name is currently falling.