If you are having problems finding a person with a surname that could be spelt more than one way and lets face it most of them can!
Is the surname spelt correctly? try slight variations noting the variation each time so as not to go over old research.
Is the first name correct? Could it be a "known as* name?
Try the earlier generations first names and see what comes up!
Try phonetic versions!for example
Daker, Dacre and Dayker all sound the sound but spelt differently.
Could the Surname have been anglicized? for example Moss from the Jewish name of Moses.
Never assume that all the information as been given correctly, it very rarely is!