Greetings Rose to IrelandXO
I have looked at your above query with interest. I found the following for you.
Wedding Certificate: William Noonan from Castlemagner Co Cork married Mary Shea on 18 Feburary 1844. Witnesses were Daniel Shea and Edmond Cushin.
Birth Certificate: Mary Noonan was born to William Noonan Newmarket Co Cork and Mary Shea on 16 September 1854. Sponsors were John Connors and Mary Connors.
[See certs attached]
Also see attached a Nunan family in the 1901 Census
Hope this is helpful to you.