It is irrelevant what it is called, or when it was called it.
Sorry for repeating myself but studies have shown that the DNA of a big percentage of the Palestinian population, and a significant percentage of the Israeli one, have DNA that is broadly consistent with the long-term occupants of the area. The people we call Palestinians are indigenous to the land, as are many Israelis - these are the people who were there before the British came, before the Ottomans came, before the Crusades, before the Arabs, before the Byzantines, before the Romans, before the Diadochi, before the Egyptians. They may even be before the Israelite conquest talked of in the Bible. They were probably at one time or another polytheists, Jews, Christians and Muslims.
It is their land, if it is anyone's. Dispossessing them, or a significant amount of them, is offensive.