Welcome Chris O'Shaughnessy
FTR - There are official records for this family
There is a Church Marriage record of James MANGAN and Margaret WALSH
in Stradbally, Co. Waterford on Feb 23 1878
LINK 1st row and written in Latin
There is a baptism for
Bridget MANNING (F) James and (M) Margaret Walsh in Abbeyside on Jan 31 1879
LINKThe Civil Record is shown as MANGAN
LINKThere is a civil birth record for Catherine in 1881
LINKJust to add you can also find this name as Manion, Manyon, Mannin, etc.