Hayyan
Yes. Hayyan is Arabic and comes from the root ḥ-y-y meaning 'to live'; it denotes abundance of life or vigor (intensive sense).
The specific personal name Hayyan does not appear as a proper name in the Quran. However, the root ḥ-y-y underlies Quranic words such as Al-Hayy (the Living, an attribute of God).
Yes. Hayyan is a lexical Arabic name emphasizing vitality and may be chosen for its positive semantic quality rather than for a direct religious reference.
In Arabic it is pronounced with a doubled y-sound and initial ḥ-like consonant: ḥayyān (approximated as HAI-yan or /ˈħaɪ.jaːn/).
The form appears in classical Arabic onomastic records and in names of scholars and literary figures in medieval Arabic sources; it is a historically attested Arabic formation rather than a modern invention.