If the "Conboy" record you found was from Mayo, the name might actually be Corboy (it's often hard to read the handwriting from the 19th century). My great-great grandmother, Margaret Curraby, was born in the townland of Treanfohanaun (mentioned in some messages above) in Bohola parish in the early 1800's, and the name was fairly common in Bohola and nearby.
The Curraby surname is a variant of the more common name MacCorboy, coming from the Irish Mac Corrbuidhe, which it is believed may come from the Irish words corr, meaning “crane”, and buí (buidhe in the old spelling), meaning “yellow”. In origin, it was possibly a nickname for someone with blond hair who was thin and looked like a bit like a crane. Most Gaelic-origin names are based on an ancestor's given name, nickname, or some characteristic (such as the Scottish name Cameron, which means “crooked nose”).
The name originated to the east, in what is now Laois and Offaly, and an online database showing the frequency of certain surnames indicates that the Curraby variant existed (originally, at least) only in Mayo. The pronunciation of the name in Irish led to a number of different Anglicized forms. In my family, it started out as Curraby in earlier records, but drifted later to Creaby, so the use of Corboy (misread as Conboy) would not be unusual. The handwritten form of the name has also sometimes been misread by researchers in ways such as Curly, Curry, and Kirby, and some scholars think that the surname Corbett is also sometimes a distorted version of the name.
I've got my DNA results psted at GEDMATCH (kit number T780556), in case you have as well and want to see whether there's a match.