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English: from the Middle English Old French personal name Eliot a pet form of the Old Testament name Elijah rendered in Greek as Ēlias and in Old French as Élie + the diminutive suffix -ot; compare Ellis . The name Aylett may in some cases also have been confused with or absorbed into Elliott. Scottish: late variant of Elwood . Scottish (of Breton origin): perhaps as some members of the Elliott clan believe a Scottish variant of the Breton surname Elleouet a habitational name from one of the hamlets named Allegot in Finistère.
Source: Dictionary of American Family Names 2nd edition, 2022