Nessa, My Grandfather, Thomas O'Connor, was born in the same area of County Clare that you mention in your posting. He was born in Killimer in the townland of Carrowdotia South.(Could Kilimey be Killimer, because I could not locate Kilimey?). While researching records from that area I have come across a few Mangans. Church records from the Parish of Killimer show the Godparents of my Greatuncle to be John and Winifred Mangan. Parish records also list the Baptism of Bridget Mangan, daugther of Martin Mangan and Bridget Keane, in July 1862. My GGreatmother was Winifred Keane but I have not yet been able to connect her to the Mangans. Griffith's Valuation also list's a Thomas Mangan in Carrowdotia North. While on a recent trip to Ireland I visited cemeteries in Labasheeda, Kilrush and Killimer and there are Mangans buried in all three. I hope this information helps you with your research.