Maziar
Yes. The name is attested in historical sources; most notably a regional ruler Mazyar of Tabaristan in the 9th century is known from Iranian chronicles.
No. Maziar is of Persian (Middle Persian) origin and is part of Iranian onomastic tradition rather than Arabic root names.
No. Maziar is not a Quranic name; its attestations are in Persian historical and biographical literature.
It is rare overall but remains in use among Persian-speaking communities who value historical Persian names.
Yes. While not Quranic or Prophetic, it is culturally accepted and used among many Muslim Persians as a historical name.