According to Haines and Cooke in their book (East Belfast Paintings and Shories from Harbour to Hills) in the late 18th century the area of the current Stormont was known as Storm Mount and was owned by Samuel Jackson.
"Resolved – That on the application of Messrs. William McMillan & Sons a new street on their property situate off Upper Newtownards Road be named Stormont Park". (18th May 1926)