"That on the application of the owners Messrs H. and J. Martin a new street on their property siutate off Deramore Avenue be named Walmer Street". (Improvement Committee, 21st October 1891).
The Marquess of Dufferin and Ava was appointed Lord Warden of the Cinque Ports with the official residence as Walmer in Kent - in 1891. A very symbolically important honour within the UK. This prestigious appointment is recognised in the naming of several streets off the Ormeau Road.
https://cinqueports.org/history/lord-warden-officials/list-of-lord-wardens/