Hi, the name and spelling of McMullin has not changed.
My grandfather and great grandfather were both Hugh Mcmullin. Big Hugh landed in Maryland in 1896 and moved north and ended up in Winnipeg, There were I believe 4 brothers and a sister. one of the brothers died on the ship, Hester ( the sister) moved to Toronto. Now that is all I have as there were no exact crew list kept back then. There my have been more, as there are McMullins everywhere and they propriated like bunnies. If he came from Ballymena Ireland, we are related.