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Dennison \d(e)-nni-son\ as a boy's name is of Old English origin, and the meaning of Dennison is "son of Dennis". Dennison has 4 variant forms: Den, Denison, Dennyson and Tennyson. For more information, see also related names Dyson and Dennis. Baby names that sound like Dennison are Tanson and Tansen. View a list of the 3 names that reference Dennison.