I'd also buy the death cert for Janet Campbell DAY, 41 yrs., 56 Waterloo Road, Ramsey, buried Maughold 13 May 1928, to see how her surname is explained.

The index ref on ManxBMD.com is:
Year, Surname, Name, Age, District, Vol, Page No:
1928, Day, Janet Campbell, 41, Ramsey, A, 600

Be sure to give them the index entry, although even with this the Registry may still charge you a search fee.

Sue