My 5xgreat-grandfather was William D'arcy married to Margaret o'Connell,he was born 1794 died 20th April,1894,i have his death cert.They had 7 children but they had others between 1845 and 1851 which were not registered,as you know that was at the height of the famine.The children were born in Coolnamunna in the parish of Cloughjordan,near Nenagh.Might be something there,it's over to you.