To add to previous replies,I quote from 2 publications.
London Metropolitan Archives.Information leaflet No.26.
Poor Law records in London and Middlesex.Register of Births.
"After 1904 a birth certificate should not state that a birth took place in a workhouse giving instead the street and number as the place of birth,for instance,4 Kings Road,St.Pancras,instead of St.Pancras Workhouse.Alternatively a euphemistic name might be used such as Twyford Lodge for Willesden Workhouse Infirmary or The Lodge,Bancroft Road,for Mile End Workhouse."
This certainly also covered deaths within the workhouse,and other institutions.
From "Old & New Croydon Illustrated,May 1894".
Croydon Union Workhouse & Infirmary.
"In 1727 the first Union Workhouse,with Infirmary attached,was erected in Croydon.The building was situated on Duppas Hill,and provided accommodation for 200 persons.The present commodious buildings in Queen's Road,near the Cemetery,were opened in October,1865,and the inmates removed from the Duppas Hill institution,the whole of the premises being utilised as an infirmary until May,1885,when the new Infirmary in the Mayday Road,close to the new Union Workhouse,was opened by the Archbishop of Canterbury."
This article indicates that Mayday Road pre-dates the naming of the Hospital.
Hope this helps.
Dave.