Palestinians are actually Trans-Jordanians.
They are Arabs..Jordan is an Arab country......People from Jordan are called Jordanians. Most of them speak Arabic as a first language...Jordan has been an independent nation since 1946.
Additionally Jordan is called The Hashemite Kingdom, because it is ruled by the Hashemite dynasty, which claims descent from the Islamic prophet, Mohammed. The Hashemite dynasty itself is named after Mohammed’s great grandfather, Hashim.