Jihan
Jihan is of Persian origin (from 'jahan') and entered usage via Persian and Ottoman Turkish; it is used by Muslims but is not originally Arabic.
No. The name Jihan and its exact forms do not appear in the Quran; the root relates to words meaning 'world' used in literature rather than as a Quranic proper name.
Yes. Forms such as Cihan (Turkish orthography) and related compounds are attested in Ottoman and Persianate naming traditions.
Common pronunciations are 'jee-HAHN' (dʒiˈhɑːn) or 'ji-HAHN' depending on regional accent.
Yes. It is used historically among Muslim communities influenced by Persian and Ottoman culture and is considered acceptable as a given name.