Kassi first appears in the U.S. registration record in 1966. Its popularity climbed over the following decades. In 1986, 107 babies received the name (ranked #1265). Today it sits well outside the top 1,000 (around #11211), with roughly 10 babies named Kassi each year. Kassi's usage has held roughly steady recently. In total, around 2,101 babies have been registered with this name since 1880.