Zernigar
Yes. Zernigar is attested in Persianate literary sources and regional name registers; it is not an invented modern neologism but a poetic compound formed from Persian elements.
Literally, it combines zar (gold) and nigār (ornament/adorner), yielding 'adorned with gold' or 'gold-decorated'.
No. Zernigar is a literary/onomastic name from Persian and Ottoman usage and does not occur in the Quran or canonical Hadith collections.
Yes. The imagery of gold and ornament appears frequently in Sufi and Persian lyric to signify inner radiance, belovedly symbolic ornamentation, and spiritual beauty; Zernigar draws on that poetic vocabulary.
Zernigar is rare today, most often encountered in South Asian, Iranian, and Ottoman-period literary contexts and occasionally as a family or given name among Persianate communities.