The word dêw in Kurdish means demon or giant, probably from the ‘Zoroastrian’ notion of Div; the personification/supernatural being of everything evil. The etymological origin of the word however means “God”, from Indo-Iranian “daiva”.

In the oldest texts of the Zoroastrian canon, the daevas are "gods that are (to be) rejected". It’s likely that the dêws were the older Gods that dualistic/monotheist Zoroastrianism rejected and demonized; instead introducing the Yazats (“worthy of worship”).

Other Indo-European languages have their own equivalent. Old Armenian as dew, Georgian as devi, Urdu as deo etc. all referring to evil creatures. Also, God in Proto-Indo-European deywós, deo -> Greek “theo”, think of the word “divine” in English. DIV-ine.

In kurmancî, the word dîn mean both crazy/madness and religion which is just a coincidence if the word “deen” is of Semitic origin but might be more interesting if it is of Iranic origin. The word şêt exists in other Kurdish dialects, but also the word “dêwane”, for crazy.

Dîn might derive from Middle Persian ‘den’ (revelation) in turn related to the notion of daena/dena (conscience) in Zoroastrianism -> cognate to Sanskrit dhena (spiritual research). Buddhism Zen derives from dhayana. Regardless, it all seems connected.