Here are the results of a search for Boylan:

5264,John,Boylan,,, John Boylan,,,,,,,,,,,,,,, Passengers on Ship ST. GEORGE from Liverpool to New York,29 September 1845, Emigrants from Dunboe - , from Londonderry to New York,page 124
5415,Rose,Boylan,,, Rose Boylan,,,,,,,,,,,,,,, List of Passengers on Ship STEPHEN WHITNEY from Liverpool to New York,6 April 1846, Emigrants from Dunboe - , from Londonderry to New York,page 124