Meredith Costain: Hello, my name is Meredith Costain and I come from the land down under, Australia. Meredith is a Welsh name that means protector of the sea. My surname is originally from the Isle of Man, a small island between England and Ireland, and the home to Manx cats which have no tails. The name Costain has changed over the centuries from the Viking name, Thorstein, which means thunderstone.