I agree with Mark Dorney in your discussion about this. I have never seen a birth certificate without a first name unless the child was a still birth, in Ireland. It maybe different in other places.
It is amazing what information sometimes comes out after the birth is registered, perhaps she always knew the name Hutchinson and put in on the marriage certificate.
Catholic names usually include a christening name which is a saints name. Celtic naming patterns - just for interest sakes - are 1st male child named after fathers father (paternal grandfather) , 1st female child named after maternal mother's mother (maternal grandmother), 2nd son named after mother's father (maternal grandfather), 2nd daughter named after father's mother (paternal grandmother), etc.