It is likely this street was named for the Earl of Roden Jocelyn, Robert (1788–1870), 3rd earl of Roden, landowner and politician. His principal residence in Ireland was Tollymore Park near Castlewellan. The name of the street appears in the The Belfast And Province Of Ulster Directory 1877. Further information: https://www.dib.ie/biography/jocelyn-robert-a4284