Nisbat (onomastics)
Adding a nisbat (Arabic: نسبة nisbah "relation") is the practice of adding a specifier as part of an Arabic name, indicating the person's place of origin, tribal affiliation or ancestry.
The practice has been adopted in Iranian name and South Asia Muslim names, where the nisbat sometimes became a surname.
Read more about Nisbat (onomastics): Original Use, Use in Onomastics, Examples