The earliest info I have is the marriage of Joseph Byrne to Elizabeth Champion 14/05/1876 in Dundrum, Co. Dublin RC church. Her parents Richard & Elizabeth.
1911 census shows Matthew ,Sherriff rank RIC (b.Waterford)(56),wife Margaret Mary(b.Galway)(46). 4 children born Clare, Richard 20,Margaret Mary 12,Matthew 10,Patrick Joseph 9. All RC.
About the sum total of my knowledge. P.