Casius is a distinctive boys' name in United States, ranking #12832 in 2008 with 5 recorded births. This places Casius in the bottom 12% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2020 with 7 births ranking #9742. In 2008, approximately 1 in every 407,989 boys born was named Casius. STABLE Recent data shows the name is currently stable.