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This is listed in G. Pawley White's "Handbook of Cornish Surnames" where it is explained as a Cornish form of George. It's also listed in Reaney and Wilson's dictionary of English surnames with examples of the name elsewhere in Southern England in the 13th Century. Here the name is said to be from Jore, a Northern French form of George.
There is (or was) also a Scottish surname, Jorie, which is explained as you were informed.