Rheia first appears in the U.S. registration record in 2011. Its popularity climbed over the following decades. In 2021, 20 babies received the name (ranked #6119). Today it sits well outside the top 1,000 (around #10079), with roughly 12 babies named Rheia each year. Rheia's usage has held roughly steady recently. In total, around 88 babies have been registered with this name since 1880.