Lex is a distinctive boys' name in United States, ranking #1654 in 2007 with 93 recorded births. The name reached its all-time peak in 2012 with 94 births ranking #1649. Since 1996, the popularity has increased by 342.9%. In 2007, approximately 1 in every 22,314 boys born was named Lex. FALLING Recent data shows the name is currently falling.