I'm currently reviewing a Magna Carta Trail, one of whose members is Thomas Lewknor. Presently he is shown married both to Joan D_Oyley and to Joan D'Oyly. I'm confident that once discrepancies between the two Joans are ironed out, they will show as the same person. But before any merges are contemplated, it would be helpful to first resolve the proper surname or LNAB.
Richardson uses d'Oyley (Royal Ancestry, III, 570). The Euroaristo page on naming does not cover the d' prefix, however, it really is the form of "de" that is used in front of a vowel, so following that logic, the LNAB would be Oyley.
I notice that one of the family seats is Stoke Doyle, so I suspect Doyle is an anglicization of the name.
Advice now would be most useful once the profiles are ready to be merged.