Lex is a distinctive boys' name in United States, ranking #1524 in 2003 with 85 recorded births. The name reached its all-time peak in 2012 with 94 births ranking #1649. Since 1996, the popularity has increased by 304.8%. In 2003, approximately 1 in every 23,238 boys born was named Lex. FALLING Recent data shows the name is currently falling.