Amghar
No. Amghar is Tamazight (Amazigh/Berber) in origin and functions historically as a Berber social title rather than deriving from Arabic lexical roots.
Yes, though rarely. In some communities a historic title can evolve into a personal name; attested uses are regional and uncommon.
No. Amghar is an Amazigh term attested in ethnographic and historical records, not in the Quran or classical Hadith literature.
It is associated with Amazigh-speaking regions of North Africa — including Kabylie (Algeria), Rif and Atlas areas (Morocco), and other Berber communities.
Approximate pronunciation is am-GHAR with the second consonant a voiced uvular/fricative (transcribed /ɣ/). Many speakers use a 'gh' transliteration.