Dex is a distinctive boys' name in United States, ranking #3314 in 2021 with 35 recorded births. The name reached its all-time peak in 2016 with 43 births ranking #2796. Since 1996, the popularity has increased by 337.5%. In 2021, approximately 1 in every 49,950 boys born was named Dex. FALLING Recent data shows the name is currently falling.