The townland of Gowelboy (as it is usually written now) is just at the eastern edge of the town of Kiltimagh. You can see a map of it and other info at this link, where you'll also have access to the Griffith's Valuation and 1901 and 1911 census records for the townland: https://www.townlands.ie/mayo/gallen/killedan/kiltamagh/gowelboy/
I couldn't find a townland in Killedan named Bohans, but there is a possibility very nearby, called Bohaun, to the southeast, just across the border in the parish of Knock, about which you can find more info at this link: https://www.townlands.ie/mayo/costello/knock/knock-north/bohaun/
That would be close enough that your parents could well have known one another in Mayo. Townland names sometimes changed their (anglicized) spelling, and sometimes there are local names for certain areas, referred to as "sub-townlands", which were used by the people living there, but not recorded as formal townland names.
As it happens, I have a great-great-grandmother from Killedan parish (Kiltimagh being the main town) named Margaret Curraby (another form of Creaby - see below). There were Creaby/Curraby familes in two places in Killedan, one being Gowelboy and the other being just a bit north of Kiltimagh, in the townlands of Pulroghnahane/Pollronahan (in Killedan) and Treanfohanaun (just over the border in the parish of Bohola). The two branches of the family were undoubtedly related, but the written records do not go back far enough to link them on paper (at least so far). I have located descendants in the UK from both branches, and have dna matches to people in both branches.
The surname Curraby/Creaby is a less common variant of the surname Corboy, which is Mac Corrbuidhe in Irish, believed possibly to be derived from the words “corr” ("crane") and “buidhe” ("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 surname originated further to the east, in what are now the counties of Laois and Offaly, and online records at roots.ie indicate that Curraby/Creaby is a rare variant of the surname, apparently found originally only in Mayo, and not widespread there. Curraby was often used in older records, with Creaby becoming the more common form with time. As pronounced by Irish speakers (which they would all still have been in the 19th century), the two forms can sound the same, and are just different anglicizations of the Irish name. The switching from one form to the other happened even in the same family - my great-great-grandmother's siblings are recorded with both forms of the name.
In case you're interested, Killedan is the anglicized from of the Irish Cill Liadáin (“Liadán’s church”), and Kiltimagh is an anglicization of the Irish Coillte Mach (“milking woods” or less likely “woods of the plain”). Gowelboy is from the Irish An Ghabhal Bhuí, which means "the yellow fork" (as in a fork in a road or path). Bohaun comes from the Irish Na Botháin, meaing "the huts".
