You need to find these people in censuses, etc in Doncaster to determine their first names--the Duncans.
There are a number of Duncan burials in IOM burial index online
www. iomfhs.im/lawsons/LawsonBMD/burials/dz_dru_dy.html?Submit=++Druggan+-+Dyson++

eliminate the spaces between www. and iomfhs

Did Elizabeth Clarke remain with same name the rest of her life?
Maybe the Patrick burial David mentioned could be her??
There is NO MI unfortunately
The Patrick Burial Register notes that she was a resident of Peel.

DJD