Blackrock is an affluent suburb of Dublin, Ireland, 3 km northwest of Dún Laoghaire. It is named after the local geological rock formation to be f…Blackrock is an affluent suburb of Dublin, Ireland, 3 km northwest of Dún Laoghaire. It is named after the local geological rock formation to be found in the area of Blackrock Park. In the late 18th century, the Blackrock Road was a common place for highway robberies. The Blackrock baths, provided for by the railway company in 1839, became popular in the 19th century but Blackrock is now a tourist destination.