Idir
No. Idir is Amazigh (Berber) in origin, derived from Tamazight vocabulary for life; it entered broader use in North African Muslim communities but is not an Arabic-origin name.
No. Idir is not found in the Quran or canonical Hadith; its significance is cultural-linguistic among Amazigh peoples.
Yes. Idir is used by many Muslims of Amazigh background; as a non-contradictory secular theophoric-free name, it is compatible with Islamic naming practices.
Yes. The late Algerian Kabyle singer-songwriter Idir (Hamid Cheriet) popularized the name internationally as an artist from the Amazigh tradition.
There is no direct Arabic equivalent sharing the same root, but names like Hayat (life, feminine) or Ayyub (patience/life narratives) convey related semantic fields; in sound, Idris is a different well-known prophetic name.