Arbab

Arbab () is a Persian word that means "boss", "master" and "landlord" or "one endowed with a special quality". It was a title used by tribal leaders in Middle East and South Asia. It is the title used by the heads of the Kasi Pashtun in Balochistan and Khalil, Momand, Daudzai and Gigyani tribe in Khyber Pakhtunkhwa. 
It is also used by the Samma tribes like Sammo, Abro, and Jakhro tribes in Sindh. It is a common family name in Iran, Pakistan and some Arab countries. 
Arbabs in Pakistan are renowned in the provinces of Khyber Pakhtunkhwa and Balochistan, in cities of Peshawar and Quetta, as there are many notable personalities belonging to different fields such as politics and art. They are considered as one of the most educated, popular, and wealthy families in Peshawar.
Origin.
The word is most likely borrowed from the Arabic, as ""Arbab" is the singular form of the plural "Rabb/ Rabb"(-"a"/-"i"/-"u," رَبَُِّ)". Although "rabb" depending on the context usually means "owner", however "rabb" also refers to pluralism (referring to "monism") used to denote "the Lord God (with many qualities or attributes)." The word "rabb" is found to be used in both Hebrew (connotation with Rabbi) or in Urdu, Hindi, Punjabi also.
"Arbab" used in Persian to signify any sort of owner or master. In modern Persian, it indicates a proprietor of rural land, and the adjective Arbābī is applied to a rural estate.
It is a family name ( نجیب زاده "Najibzādah") in the Middle East, especially in Iran. It indicates that those families have a notable background in the history of Iran and were mostly landlords, or heads of their tribes or states. Arbab was the biggest landlords.