Grant can be both a surname and a given name. The name is of English and Scottish origin, and there are several possible origins for the name.
One possible origin of the name is from a nickname derived from the Anglo-Norman graund, graunt ("tall", "large"). This in turn was derived from the Old French grand, grant, which was originally derived from the Latin grandis. This nickname was likely given to a person of remarkable size or merely to distinguish two persons bearing the same name.
Another possible origin of the surname is from a medieval personal name ultimately derived from the Old English byname Granta, which might have meant "snarler".
The surname may also be an alternate spelling of the German Grandt or Grand.
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