Flex is a distinctive boys' name in United States, ranking #12685 in 2015 with 5 recorded births. This places Flex in the bottom 10% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2022 with 6 births ranking #11307. In 2015, approximately 1 in every 383,252 boys born was named Flex. RISING Recent data shows the name is currently rising.