Arran Islands 1867 Family of Hernon

Wondering if there is any information further on Mary Hernon who was born 1867 in arran Islands to parents Mary Mullin and Patrick Hernon. In my family's files, came accross her birth certificate registered copy dated 1935 stamped in the county Home, Loughrea, Co Galway. She would be my great grandmother. She married Michael Kelly. Also, there is a word "Onaught" on document and don't know what that means - anyone know?

Judy

Connecticut, USA