Lex is a distinctive boys' name in United States, ranking #1666 in 2005 with 81 recorded births. This places Lex in the top 12% 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 285.7%. In 2005, approximately 1 in every 24,656 boys born was named Lex. FALLING Recent data shows the name is currently falling.