Lex is a distinctive boys' name in United States, ranking #1863 in 2010 with 78 recorded births. The name reached its all-time peak in 2012 with 94 births ranking #1649. Since 1996, the popularity has increased by 271.4%. In 2010, approximately 1 in every 24,595 boys born was named Lex. FALLING Recent data shows the name is currently falling.