O'Brien/Bryan
I am trying to find record of marriage of my great great grandfather Patick O'Brien and Margaret (surname unknown) in County Wicklow. They were Roman Catholic, married probably around 1835. The family emigrated to South Australia in 1850 on the ship "Constance", by then had 45 children. Their name listed on the passenger list as "Bryan" (presumably illiterate) and someone copied their name that way.