@njusacarrig - thanks. I've traced that my grandfather's brothers & sisters emigrated between 1901-19011 to New York (and one to chicago)...anything before that I need to research a bit more at the Clare end.
I know that my greatgrandfather James inherited the farm in Moybeg, Lahinch, Co. Clare from his father & the griffiths valuation of 1850s shows Austin Hanrahan in Moybeg...I need to check locally for details of this Austin.