I've just started my research of Durnin surname. So far I've come across the following surname variants for Durnin: Durning, Dornan/Durnan, Durneen, Durnian, Dornton, Dorrington. For example, Mary's marriage cert. name was Durnin, children's birth certs. Mary's name is given as Dornton, her death cert. shows as Dorrington. Doesn't help much when you are trying to do research, especially in Ireland!