"Submitted application from owners of property in new street off Cregagh Road to have the street named Haddington Road, and referred to the Surveyor for report". (15th February 1910).
"That on the application of the Martin Estates Co. Ltd., a new street on their property situate off Creagh Road be named Haddington Gardens". (8th March 1910).
It seems likely that this street was named after one of the holders of the title "Earl of Haddington", a title in the Peerage of Scotland created in 1627 and still in existence. This argument is strengthened by the presence of Onslow Gardens / Parade / Park and Shelbourne Road in the same neighbourhood. Onslow (Shropshire, England) and Shelburne (sic, Co. Wexford, Ireland) are unrelated geographically but are also names of earldoms. The Royal Burgh of Haddington is a town in East Lothian, Scotland. Haddington is one of a number of Anglo-Saxon names, such as Coldingham, in this south-eastern corner of Scotland, which was once part of the kingdom of Bernicia, and later, Northumbria, before being incorporated into Scotland in the tenth century. McCready also attributes Haddington Road in South Dublin to the Earl of Haddington (Dublin Street Names, Dated and Explained, p. 47).