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Found it in the Twilight series

this name is derived from the name Gaius, a Roman praenomen, or given name, which is of Etruscan origin, meaning unknown. This was a common Roman name, the most famous bearers being Gaius Julius Caesar, the great leader of the Roman Republic, and his adopted son Gaius Octavius (later known as Augustus), the first Roman emperor.

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We call our Caius Cai or Cai-Cai

Meanings and history of the name Caius: | Edit

Alternate form of the Roman praenomen Gaius.
Also means to rejoice.

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Julius Caesar whole name was Gaius Julius Caesar.

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