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Last name Dalby (Dalby , دالبي, دولبي) , globally, is quite a common family name. The last name Dalby is characteristic of Northern Europe, particularly Denmark, where it is quite a rare surname, Norway, and the United Kingdom. Measured by absolute frequency, this name is the most popular in the United Kingdom, the United States, and France. Very seldom, Dalby is the forename as well as the last name.