H Frank, According to the surname distribution database at Leitrim-Roscommon.com, the ENGLISH name was concentrated in Tipperary, Antrim, and Dublin Counties with over 50 percent of the names having births registeres there in 1890. You can also check the National Archives database for Famine immigrates which seems to fall in the time frame of the arrival of your ancestor's. Check these individual counties for more resources as well. Hope that helps, Becky