Hi - thank you for your message. Do you know much about their emigration? The dates, the reason why they left, who they may have travelled with?..etc..Generally more information was given at the port of arrival rather than the port of departure. If you knew which city they arrived at (e.g. Liverpool, New York, etc.), this could be a good place to find more information. -And perhaps even find out an exact place of origin.
If you haven't already, you might try some of the following:
The Library & Archives of Canada - http://www.collectionscanada.gc.ca/index-e.html
US National Archives/Immigration info: http://www.archives.gov/research/immigration/
The Boston Pilot; From October 1831 through October 1921, the Boston Pilot newspaper printed a ?Missing Friends? column with advertisements from people looking for ?lost? friends and relatives who had emigrated from Ireland to the United States. This extraordinary collection of 40,743 records is available here as a searchable online database, which contains a text record for each ad that appeared in the Pilot. http://infowanted.bc.edu/
Some additional links which may be helpful are:
The National Archives of Ireland http://www.nationalarchives.ie/genealogy1/genealogy-records/introduction/
The National Library of Ireland http://www.nli.ie/en/family-history-introduction.aspx
The National Archives UK ? genealogy search: http://www.nationalarchives.gov.uk/records/looking-for-person/
The Public Records Office of Northern Ireland http://www.proni.gov.uk/index/family_history.htm
Remember to post as much information as you can with regard to the people you are researching. The more information you post, the more likely it is that one of our volunteers will be able to advise or assist you. Also include information concerning which sources you may have already used so others may further your search.
Kind regards,
Genealogy Support