Baig, also commonly spelled Beg, or Begh (Persian: بیگ, Bay, Turkish: Bey) was a title of Turko-Mongol origin, which is today used as a surname or middle name to identify lineage. It means Chief or Commander and is common in Pakistan, India, Afghanistan, Bangladesh, Turkey, Iran, Caucasus, Central Asia and Eastern Europe (former Yugoslav) and among their respective diaspora.