Why does this person's parents, both have N.N.? Why not just leave No Name in each? And I thought her maiden name is Owen?
N.N. is a genealogical abbreviation for Nomen Nescio - “I do not know the name.”
https://en.wikipedia.org/wiki/Nomen_nescio
Genealogists often use the abbreviation to signify an unknown or partially unknown name (such as N.N. Jones).
But it can be confusing. I’ll see if we can make the family clearer.