Vesey/Walsh

Hi, I was hoping for some guidance with my problem. I'm looking for my ancestors, a Ann Vesey/Vecy married Michael McGuinness (a Thomas Vesey was a witness in one of the marriage records as there is two with the same names just different months) Anyway, I think (if I have the right Ann Vesey) was baptised in St. Finnbars, cork city. Her dad is John Vesey and mum is down as Sesla Walsh (though she's also listed as Sisla in another record) I'm aware this could be another name for Celia/Cecelia but that's all I can find with regards to John and Celia/Cecelia. I don't think they were married as I've search everywhere (inc census) I'm wondering whether Celia was a mistress before John was married?! As I know there is a John Vesey who is a Viscount or something? I don't know, I'm baffled with it all to be honest, I'm on ancestry and find my past. I've searched the archives but coming up empty handed. Any help would be greatly appreciated, Thankyou, Hayley Dooley (nee McGuinness)