Khalfan
Khalfan comes from the Arabic root خ-ل-ف (khalafa), which relates to succession, following, or coming after.
Yes. Khalfan is attested as a given name and surname among Swahili-speaking Muslims in East Africa, such as in Zanzibar and coastal Tanzania.
They share the same root, but Khalifa (خليفة) is a distinct term meaning 'caliph' or 'successor' and is a formal title; Khalfan is a vernacular personal name derived from the same root.
No. The specific personal name Khalfan does not appear in the Qurʾān; its attestations are in onomastic records and civil registers, especially in East Africa.
Short forms depend on local practice; in Swahili contexts one might hear 'Khal' or simply the full name without abbreviation.