Caius is an ancient Roman cognomen, meaning "rejoicing" or "cheerful." It was commonly used among the early Romans and has been associated with several notable historical figures, such as Gaius Julius Caesar, one of Rome's most famous leaders. The name Caius has a strong, traditional sound and was particularly popular during the Roman Empire.
The name Caius experienced a significant increase in popularity over time, with birth counts rising steadily from 5 in 1994 to 156 in 2020, and then fluctuating between 130 and 150 from 2017 to 2023. This trend suggests that the name Caius has gained considerable traction among parents over the past three decades, with a total of 1867 babies named Caius born between 1994 and 2023.