Caius is a distinctive boys' name in England & Wales, ranking #976 in 2025 with 31 recorded births. The name reached its all-time peak in 2023 with 35 births ranking #890. Since 1996, the popularity has increased by 520.0%. In 2025, approximately 1 in every 8,772 boys born was named Caius. FALLING Recent data shows the name is currently falling.