Tijani
Tijani is a nisba-style name indicating association with al-Tijani or the Tijaniyya Sufi order; it denotes spiritual affiliation rather than a simple lexical meaning.
Ahmad al-Tijani (1737–1815) was the founder of the Tijaniyya Sufi order in North Africa; the name Tijani is derived from that association.
Yes. Through the spread of the Tijaniyya, the name Tijani is used in West Africa and along the Swahili coast among followers and families allied to the tariqa.
Yes. It is used by families to express Sufi affiliation and may appear as a given name or as a nisba/surname; it is an established, historically attested Muslim name.
No. The name is rooted in historical and hagiographic sources tied to the Tijaniyya order rather than the Quran.