Lex is a distinctive boys' name in United States, ranking #3471 in 2001 with 25 recorded births. This places Lex in the top 28% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2012 with 94 births ranking #1649. Since 1996, the popularity has increased by 19.0%. In 2001, approximately 1 in every 77,713 boys born was named Lex. FALLING Recent data shows the name is currently falling.