I think the death record for William in 1913 may be incorrect.
I believe this is the correct record.
The address given is Aughakilconnell. This townland borders the Annakeenty we have already seen. This link shows you the details.
William is a widower at his death so Mary pre-deceased him. I could not find a record of her death, it is not unknown for records to be mis-transcribed so it may appear at a later date when there are corrections to the registers.
I could not find a marriage record for the couple, it should be in the Civil registration records but it's not coming up. Perhaps they married outside the country.
There is a baptism record dated 21 Feb 1847 of a William Guckian to Thomas Guckian and Bridget McHugh in Kiltubrid parish which may be relevant but it is difficult to know if it is the correct one without corroborating evidence.
Nothing conclusive on Mary McNama I'm afraid.