What is your mother's family name (madden)? You won't believe this but I live in Tullinkisay, Magherafelt. I know current families and might be able to share some current information with you.
As one of your respondents has said it is a townland name, not known outside of the 'church' areas. You mum will now that it is divided into a place called Newbridge, Aughrim and Magherafelt.
Many names still exist in the area (older family names) like Shaw, Bradley and so on.
I am related to Shaws, previously through McElhones. I am about to search for McElhone families and hope to find someone with information to share.
Hope this is helpful.
Celia.