All are living so no names used.
I was checking registration details of a birth since 1984 and accidentally entered the mother's maiden name as the family name - the birth appeared:
John Jones mother's maiden name Jones
I knew the parents were definitely married having seen the marriage details so searched again with the family name and that also appeared:
John Smith mother's maiden name Jones
Absolutely no doubt that both are the same person as the child's unusual set of forenames only appear twice in 170 years - same quarter, same district, same page! - and the surnames in both cases are unusual
Any idea how or why this could have happened?