Dower is an Irish surname from the Gaelic ó Dubhuir, meaning "black haired". Dower in Irish is "O'Duibhir" (pronounced O Dweer), meaning grandson of Duibhir, an ancestor who, by tradition, lived sometime around the tenth century. The exact meaning of the ancestor's name is unknown, though 'black skirt' is one possibility, but the common modern consensus is that it means 'black and dun-coloured' which is thought to refer to Duibhir's hair coloring. Today there are 1200 people living in the United States with the surname Dower.
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