The majority of the Mastois settled in Sindh are in the districts of Dadu, Larkana, Sukkhur and Karachi.
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Mastoi is derived from the Balochi word mast, which means "Brave" in the Balochi language
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Mastoi clan migrated from Kachi Bolan and settled in other parts of the existing Pakistan, A significant number of Mastoi tribe still lives in the Kachi and near by Sindh-Balochistan Border line.