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".
(male) Caiius, Carius, ..
(female) Cais, Casea, ..
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)
Shown below is the baby name history of Caius for boys. Caius was first listed in 2012 and reached its top rank of #1375 in the U.S. in 2014. (2014 Birth Statistics)
Below is a graphed comparison of the history of the boy name Caius and corresponding names. Popular variation forms of Caius (#1375 the previous year) ranked in the Top 2000 are Kay and Kaye. Adoption of these forms of Caius was well-received among parents 8 decades ago (average #1228) and is now significantly diminished, with the form Kay becoming less fashionable.
Caius is pronounced similarly to Cace, Case▲, Cass, Cayce, Caz and Kass. Other recommended 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.