I have reason to believe that both Noonan and Sheridan are linked names in my family tree. My great grandmother Deborah Noonan married Jeremiah Halahan in 1870. We have unidentified photos on the back of which is written 'Sheridan'.
I am fascinated by both names are of interest to you. Do you know how they 'relate'? I am thinking that Deborah Noonan's mother may have been a Sheridan. Did Breen Noonan have a Sheridan on his maternal line?
I'd love to hear from you. Happy hunting. Geraldine