This street was called after Archibald Primrose, 5th Earl of Rosebery, who was British Prime Minister in 1894-1895. Although the title Earl of Rosebery is in the Peerage of Scotland, it refers to Roseberry Topping (note the spelling with 2 Rs), a hill in North Yorkshire near the estate of the 1st Earl's wife.
Rosebery Street is situated off Bloomfield Avenue. See also Rosebery Road and Rosebery Gardens, BT6.