Róisín can also be pronounced Row-Sheen, as is with my daughter. This can be due to the accent in Ireland Northern and the Free state of Ireland (Eire).
My name is Roisin, and people do find it really hard to say in England. Even after I have told them it's Row-sheen, they usually call me Ru-shin because of the accent differences. My mother's family in Northern Ireland call me ra-sheen, so I think it does depend where you're from.
My name is Roisin. How ever i live in Australia and the name is very very uncommon here. i only know 3 other Roisin's. At school and everywhere especially if it is at assembly or the teachers calling out the roll, they always say my name wrong. I correct them by saying 'Rosheen' but sometimes they just don't get. But i love my name because it is so unique and a lot of people love my name.