There's an island in Greece called Ro, near another island called Kastelorizo. Around the Classical and Hellenistic periods, Ro used to be called Rhoge and Kastelorizo was called Megisti. But like a lot of places in periods such as the Neolithic period, nobody knows what places were called that far back in history; even if they were colonized.
Megisti/Kastelorizo has been proven to have been colonized during the Neolithic period, but the name of the people and the island is unknown.
So if you're telling a story taking place in 'pre-Megisti' or 'pre-Rhoge,' is it acceptable to have an alternate historical name for those places? Or should we always wait until discoveries reveal their actual names? You folks know your history, so I came here to ask :{o~