Leoncio first appears in the U.S. registration record in 1951. Its popularity climbed over the following decades. In 2007, 16 babies received the name (ranked #5581). Today it sits well outside the top 1,000 (around #10415), with roughly 7 babies named Leoncio each year. Leoncio's usage has held roughly steady recently. In total, around 512 babies have been registered with this name since 1880.