Conversation so far:
Where did the name Gaius Julius Caesar come from?
Three possible origins: the first Caesar had a thick head of hair (caesaries); he had bright grey eyes (oculis caesiis); or he killed an elephant (caesai in Moorish) in battle
Who called Julius Caesar his full name of Gaius Julius Caesar?
Are there any other interesting aspects about this article, besides where Julius Caesar's full name came from?
In Greek, during Caesar's time, his family name was written Καίσαρ (Kaísar), reflecting its contemporary pronunciation.

Question: is that name used elsewhere?
Self-contained rewrite: Is the name Gaius Julius Caesar used elsewhere?