Here's the Arabic Wikipedia article on nonbinary gender identity: https://ar.wikipedia.org/wiki/%D9%84%D8%A7%D8%AB%D9%86%D8%A7%D8%A6%D9%8A
It gives Arabic terms for genderqueer and nonbinary. I don't speak Arabic though, so I can't vouch for whether these are terms that enbie Arabs would actually use.