Did you know that a lot of #Dune 's Fremen language is just Arabic? Some examples:

Muad'Dib: Teacher
Lisan al-Gaib: Teller of things yet to come.
Shai-Hulud: Eternal thing, or Eternal Shaikh/Sheik (old man).
Mahdi: The guided one
Arrakis: the dancer, the name of a star (Mu Draconis A)

Here's a bigger list: https://www.reddit.com/r/dune/comments/ec1f2w/80_arabicislamic_words_in_dune/