Lex is a distinctive boys' name in United States, ranking #2985 in 1998 with 27 recorded births. The name reached its all-time peak in 2012 with 94 births ranking #1649. Since 1996, the popularity has increased by 28.6%. In 1998, approximately 1 in every 70,790 boys born was named Lex. FALLING Recent data shows the name is currently falling.