Cassius is a distinctive boys' name in United States, ranking #583 in 2025 with 504 recorded births. The name reached its all-time peak in 2021 with 607 births ranking #485. Since 1996, the popularity has increased by 1,100.0%. In 2025, approximately 1 in every 3,389 boys born was named Cassius. STABLE Recent data shows the name is currently stable.