Lex has been given to about 4,010 people in the United States since 1880. It was most common in 2023, which makes it a current name.
Its best year was 2023, when 95 babies were given the name, ranking 1794th. The typical living American called Lex is about 21 years old today. It is relatively most common in Illinois, where it accounts for 0.01% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.