Lex is a distinctive boys' name in United States, ranking #1794 in 2009 with 84 recorded births. The name reached its all-time peak in 2012 with 94 births ranking #1649. Since 1996, the popularity has increased by 300.0%. In 2009, approximately 1 in every 23,611 boys born was named Lex. FALLING Recent data shows the name is currently falling.