Was reading Susan's and Martin's posts about Mulrey's from Dangan. It may be that one of my relatives may have been related to your family at the beginning of the 20th century, but it would be somewhat of an arm's length relationship to my immediate family.
My grandfather's brother (and therefore my father's uncle), John Kirwan, married Ellen Mulvey in 1903. Both were from "Dangan". (More on that later.) Her father's name is listed as Patrick Mulvey. When their first child (Mary) was born, Ellen's maiden name was spelled "Murly". A Patrick "Murly" leased a small amount of land in Danganbeg, according to Griffith's Survey (1848 to 1855). When the land leased by Patrick ( as well as my great- great grandfather Patrick Kirwan's farm) was sold under the Encumbered lands law in about 1855, Patrick's name was spelled "Murley". Not hard to go from one spelling to the next. If there is a relationship, there were Ellens in several generations of Murlys.
A liitle demographic background, which I hope will not bore you. "Dangan" is a "place", apparently well used in 19th century Ireland as an identifiable location. It had a post office at that time, but was never a legal subdivision, even though it is used in all kinds of legal documents, as you have seen. In contrast, there are three townlands (legal subdivisions of hundreds of years standing, but without taxing or police powers (!) that incorporate the name: Danganbeg, Dangan Oughter, and Dangan Eighter. The PO was in Dangan Eighter, I think. The three Dangans are contiguous, and Danganbeg and Oughter almost surround Slievegorm, the other townland in your histories. My family was, it seems, from Dangan Oughter.
So, we have two more names, Patrick and a second Ellen to add to the mixmaster. It's also interesting that Martin has John Thomas and Ellen from Danganbeg and Susan has Thomas and Ellen from Slievegorm in the same census. Can't be more than a mile apart.