Regarding the above query, there is a Mary Dalton born to Matthew Dalton & Catherine Byrne at Waterford City (Yellow Road )10/7/1859. Is this relevant ? Can't say that I have ever heard Dalton changing to Alton but then there is always exceptions. I cannot find any Birdhill, Tipp connection though.The prename Matthew is not that common in the Irish Daltons. regards C.