In Arabic names, a nisba (Arabic: نسبة nisbah, "attribution"), also rendered as nesba or nesbat, is an adjective surname indicating the person's place of origin, ancestral tribe, or ancestry, used at the end of the name and occasionally ending in the suffix -iyy for males and -iyyah for females.
[1] Nisba, originally an Arabic word, has been passed to many other languages such as Turkish, Persian, Bengali and Urdu.
In Arabic usage, that pronunciation occurs when the word is uttered in its construct state only.
The nisba to a tribe, profession or a town is the most common form of surname in Arabic.
A nisba "relation" is a grammatical term referring to the suffixation of masculine -iyy, feminine -iyyah to a word to make it an adjective.