Who said anything about accents? People can pronounce my name right if they are told how it's said. xD It's just that the name 'Shona' and the way it is pronounced is way more common than 'Shauna' and the way it's pronounced. So, people look at my name and think it's just an odd way of spelling 'Shona' and it's pronounced the same way as 'Shona'.
People would say your name... as it's meant to be pronounced. How else can you pronounce Shaun?