What is "qureshi"

Qureyshi (also known as Qureshi, Quraishi, Qurayshi, Qureshy, Quraishy, Qoraishi, Qoreshi, Koraishi, Kureshi, Kureshy, Kureishi, Coreish, ) is a Muslim family name, originating from the Quraysh tribe, which was the noblest tribe in Mecca around the time of the birth of the Prophet Muhammad. At the time of Muhammad’s birth, his grandfather Abdul-Muttalib was the tribal head.