My grandmother grew up in the townland of Callow, which adjoins Culdoo/Culduff to the west. Her father was a McNulty and her mother was a McDonnell, and both surnames were also common in Culdoo/Culduff, and in other nearby townlands in the parish. There were many intermarriages among the McNulty’s, McDonnell’s, and other local families, including the Kirrane/Kerrane family and the Peyton family. I don’t know of a specific connection to the ancestors you named, but they were undoubtedly distantly related to my grandmother, and I can provide some background information which might be of interest.
Culdoo and Culduff are two anglicized forms of the Irish name Cúl Dubh, which were often used interchangeably. Cúl Dubh can mean several things, such as “black hill” or “black nook [in a hill]”. The word dubh in Irish can be pronounced as either “doo” or “duff”, depending on the dialect of Irish being spoken. Northeastern Mayo was located in a dialectical boundary area, so it can be pronounced either way there.
Like Callow, Culdoo is located in the Catholic parish of Killasser. There was a history book published in 2011 in Ireland, entitled “Killasser: Heritage of a Mayo Parish”, which has lots of information about the area. The author was Bernard O’Hara, who was apparently working with the Killasser/Callow Historical Society. I was able to find a copy on Amazon a few years ago. The ISBN is 978-0-9850753-1-6, in case you want to look for it there or elsewhere. It is also available for downloading on Kindle readers, at a very reasonable price.
In Irish, Killasser is Cill Lasrach, meaning “Lasair’s church”. Lasair (from the Old Irish lasar, meaning “flame” or “fire”) was not an uncommon name in medieval Ireland, but Cill Lasrach is believed to be named for a particular saint who was born in County Fermanagh and came to the Killasser area, where she is believed to be buried.
Killasser is also the name of a “civil parish”. Civil parishes were once church-related, but evolved into administrative districts, and their boundaries (and often their names) are not always the same as those of the local Catholic parish. You can read more about the civil parish of Killasser at this link: https://www.townlands.ie/mayo/killasser/
That link sometimes stops working, but eventually it comes back into operation. The Killasser page includes an interactive map, and you’ll also see further links to information about each specific townland, once again including a map.
You can search the parish register of baptisms and marriages for the Catholic parish of Killasser at this link, where you can download pages from the register and enlarge them on your computer for easier reading:
https://registers.nli.ie/parishes/0134
The surnames Peyton, Payton, and Patton, when not of English origin, are all anglicizations of the Irish surname Ó Peatáin, which is based on a diminutive form of the name Patrick. The surname originated in Ulster, and is most common there, especially in Donegal. Like many Ulster names, however, it is also found in Mayo, where many people migrated after the Plantation of Ulster in the 1600’s.
The surnames Keerane and Kirrane are found principally in Mayo, where they are both anglicizations of the Irish surname Ó Cearáin, which is based on the Irish word ciar, meaning dark brown or black (probably referring to the dark hair of a real or legendary ancestor). They may be related to the surnames Ó Ciaráin and Ó Céirin, which are found in Ulster, and are usually anglicized as Kerrin, Kerin, Kieran, or Kearns.
The McDonnell surname in Mayo is ultimately of Scottish origin. There was a gallowglass (in Irish, gallóglach, or “foreign fighter” = mercenary) family living in the Glens of Antrim (many people in Ireland have ancestry in such gallowglass families), and the McDonnell's in Antrim were related to the Scottish MacDonald clan, having come from Scotland to settle in the Glens of Antrim in the 13th century. By the 15th century, they controlled all of North Antrim. A large number of those McDonnell's were brought from Antrim to what is now Mayo in the late 14th century, to assist the ruling family of that area, the Anglo-Norman Burke family. Some now also live across the border in neighboring counties (the county boundaries were a later creation).
The surname in Irish is Mac Domhnaill, which means “son/descendant of Donal”, but it is spelled MacDhòmhnaill in Scottish Gaelic (with the same meaning). The “d” at the end of MacDonald is a later addition to the anglicized version of the name. MacDonald is more common in Scotland (and among Scots settlers in Ireland, especially in Ulster), but McDonnell and McDonald were both used in Ireland as anglicized forms of the surname, sometimes within the same family in various records.
