The term "Palestinian" is just the name people use for the indigenous people of the area at this time. And it is completely irrelevant to the question of the culture and identity of those people. In the US, we call the indigenous people of the land that is now the US, "Indians", but that term is irrelevant to who they are and were, and to their culture and identity.

The indigenous people of the area we now call Israel and the Palestinian occupied areas have their own identity and culture that goes back thousands of years, and is irrelevant to and independent of any names we would apply to them.