Lex is a distinctive boys' name in United States, ranking #1907 in 2002 with 59 recorded births. The name reached its all-time peak in 2012 with 94 births ranking #1649. Since 1996, the popularity has increased by 181.0%. In 2002, approximately 1 in every 32,906 boys born was named Lex. FALLING Recent data shows the name is currently falling.