There is no real difference between
Palestinians, Syrians, Jordanians and Lebanese,
in terms of language, culture, history, religion, literature etc…
besides the interactions of some of them with Jewish immigrants.
They all live in Ottoman Palestine.
They never called themselves or were they called by others
“Palestinians” except in the sense of people
who lived in a placed called Palestine,
much as you might refer to some people as Iberians or Anatolians.
Anyone, including Jews, living in Mandate Palestine, and before,
was called Palestinian, in the same sense.