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The surname Grant is English and Scottish in origin, with two main hypothesised points of creation. Firstly, it is considered to be a nickname, deriving from the Old French 'grand' (large) and have been given to someone of large stature, being passed to their children. The second most common source of the Grant surname is a patronymic name, relating to those who descend from someone given the popular English medieval name 'Grant'.
https://www.findmypast.co.uk/surname/grant#:~:text=The%20surname%20....