I can see what you mean

If you're going according to name sake, then yes you could say that most were not Jordanian.
That said most of the aforementioned JRF members were of Palestinian and or Levanti origin (Lebananon, Jordan, The Palestinian Territories, Israel, Eastern tip of Egypt). The Hashemite Kingdom of Jordan formed the majority of Palestine. At least 90% of Jordanians are of Palestinian extraction. So in this sense we can say Jordanian
In general location, strength of historical ties and Diplomatic and Cross cultural relations, are but a few (yet strong) deciding factors.
Levant relatives: Queen Noor Al-Hussein, Princess Ghida Talal, Princess Dina, Princess Sarah Al-Feisal,
Palestinian Relations:
Princess Haya bint Al-Hussein
Princess Noor bint Asem
Princess Alia Al-Tabba
Princess feryal Mohamed
Queen Alia Al-Hussein
Princess Alia bint Al-Hussein
Princess Basma bint Talal
Queen Rania Al-Abdullah
I know that written down seems quite confusing lol