Fadhili
Fadhili is Swahili in usage and form, derived from Arabic root فضل (fadl). It reflects Arabic lexical borrowing into Swahili.
It means 'generosity' or 'kindness'—a virtue name expressing benevolence and moral excellence.
Yes; for example the Kenyan musician Fadhili William (mid-20th century) is an attested bearer demonstrating Swahili coastal usage.
The specific name 'Fadhili' as a proper name does not appear in the Quran; the root فضل (fadl) occurs in various Quranic contexts but there is no Surah:Ayah reference for 'Fadhili' as a proper name.
Fadhili is typically masculine in East African usage; feminine related forms include Fazila or Fadhila (Arabic: فاضلة).