My name is Cícero, I'm from Brazil. A cousin likes to call me Kikero. In the north west of my country this name is common because an ancient and famous priest who lived there.
Cicero was the name of my Blue & Gold Macaw; who was quite the orator... a talker for sure. As one of the anonymous users suggested his nickname was CiCi...
Though it is almost impossible to tell how the ancient Romans would have pronounced something, judging by the fact the Romans were obviously Italian, they probably, as I was informed by my Latin teacher, have pronounced -ce and -ci like modern Italians. That would make this name Chi-che-ro. Though of course, one cannot be certain.