I have been able to find family by the name of Bligh in the passenger lists from Ireland to New South Wales in 1839-1840. Mary Bligh under protection of her brother Patrick from Elphin, Roscommon. Daughter of Michael & Catherine (Quinn) Bligh. Visited Elphin briefly in 2013, but didn't know where to begin the search. (So enjoyed the windmill.)
Betswebb1:
Welcome to Ireland Reaching Out!
Here is the link to the online parish register for the RC parish register. http://registers.nli.ie/parishes/0556
I would search for Bligh baptisms.
Roger McDonnell