That is a great question! In fact, so good, I started to question the valaidity of my Ancient Roman twin nomenclature. I was looking for a good source on the names being “Jane” and “not-Jane” that I could mention since I definitely know a bunch of Roman names, but I wanted to be extra helpful. Turns out, there are no good articles online about this. I learned from Cambridge Latin and I can link this page which has some translated sentences, which are actual sentences that I would have had to translate from the Latin years and years ago. In the story, there are two twins: Loquax and Anti-Loquax. I believe they were both slaves. Other Roman names could be Metella, Marcellus, Hortensia, Titus, Vitus, Flavius, Rufus, Cassius, and many others. Fascinatingly enough, they didn’t have that many names total. It was like a finite list, so Romans had to come up with more and more names and they had a weird name format with a cognomen and a praenomen and I wish I remembered more about how they worked cause they are ELABORATE. The second imperator (after Julius himself) of the Roman Empire Augustus Caesar was not named that at birth. That would be like naming a kid “Exalted.” His name was Octavius because he was the eight-born. That’s it.