What does Caius mean?
Common Roman form of Gaius. This was the name of the infamous Roman emperor called Caligula, a nickname meaning "little boots". This referred to the minature soldier's footwear he wore when he was young. A 16th-century English physician endowed a college at Cambridge University called "Gonville and Caius".
How popular is Caius?
Caius is an uncommonly occurring first name for men. Caius is an equivalently unusual last name too for all people. (2000 U.S. Census)
Below is a graphed comparison of the history of the boy name Caius and corresponding names. The only popular variation form of Caius (outside Top 1000) ranked in the Top 1000 is Kay. Adoption of this form of Caius was well-received among parents during 1930-1939 (#572) and is now less, with Kay becoming less fashionable. (2014 Birth Statistics)
Thinking of names?
Caius is pronounced similarly to Cace, Case▲, Cass, Cayce, Caz and Kass. Other recommended similar baby names are Arius, Cadmus, Caide, Caile, Caily, Cain▲, Caine, Caird, Cairn, Cairns, Cairo, Calum, Capps, Cassius▲, Cetus, Claus, Clitus, Comus, Cris, Cyrus▲, Dacius, Darius▲, Fabius, Jairus, Janus, Jarius, Magus, Manus, Marius and Pius. These names tend to be more frequently used than Caius.