From Irish Names and Surnames 1923
Mac GIOLLA CHRÍOST—IV—M'Gillachrist, M'Gillacrist, M'Gillechreaste, Gilchrist, Guilchrist, Gilcrist, Gilchrist, Gilchreest, Gilcriest, Gilcrest, Kilchrist, Kilchriest, Kilcreest, Kilgrist; 'son of Giolla Chríost' (servant of Christ); a scattered surname, found chiefly in Leitrim, Longford, Westmeath and Carlow; now also common in Ulster, where it is probably of Scottish origin.
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