The McFish clan originated when Ronald O'Fish defected and became a Catholic. There was such an outcry from the Protestant pirate Scots that Ronald was forced to move to America and take up a new name, McFish. There Ronald got married and had several children and passed down his name creating a liniage of Catholic Scots who held a grudge against their similarly named Protestant cousins. Because the O'Fish have a longer history, they vastly outnumber the McFish.
While Ronald McFish is considered the father of the McFish clan there have been other notable McFish. Hillroy-Lemon McFish was the semi-famous para-musical technographic extreamist. She was the first musician to record an album entirely in leet. Nobody is quite sure how she did this but apparantly it works quite well.