There are Roman Catholic church records available for the diocese of Glinsk (Elphin). These date from 1836 for baptismal, marriage and burial records. You can find these at the National Library of Ireland, Pos. 4620, or the Roscommon Heritage and Genealogy Centre in Strokestown, http://www.roscommonroots.com/. If you have any difficulty, you could try writing to the parish priest for more assistance.
A trade such as a tailor, could very well be listed in one of the trade directories for that period. You could try Slater's Directory from 1846: http://www.failteromhat.com/slaterc.php
You could also try checking the land records called the Tithe Applotment Books (1823-38) or the later Griffith's Valuation (1848-64). Griffith's is freely available here: www.askaboutireland.com or here: www.failteromhat.com Failte Romhat has lots of other useful links you could try looking at. Tithe Applotment Books (1823-38). Microfilm copies of the books for all of Ireland are available at the National Archives of Ireland (NAI) http://www.nationalarchives.ie/genealogy1/genealogy-records/tithe-applotment-books-and-the-primary-griffith-valuation/ or the Church of Latter Day Saints (LDS).
You can information about the frequency of the name in the mid-19th century and any other variant spellings of the name here: http://www.irishtimes.com/ancestor/surname/
Hopefully someone living in the local community will recognise the family names and be able to help you further.
Please make sure you link anyone else in your family who is interested in their Irish heritage to our site - and indeed anyone else you know of Irish heritage.
Genealogist (Ireland XO)