Caius is a distinctive boys' name in England & Wales, ranking #1327 in 2015 with 19 recorded births. The name reached its all-time peak in 2023 with 35 births ranking #890. Since 1996, the popularity has increased by 280.0%. In 2015, approximately 1 in every 17,538 boys born was named Caius. FALLING Recent data shows the name is currently falling.