William McMillan was my great Grandfather. I had previously thought he might be the William McMillan who was drowned in Glasgow Harbour, 31 October 1901, who was the Master of the Katherine. I had a vague memory of my Mother saying her grandfather had a ship called the Katherine, which I had just named my daughter, but that could be wrong, although 2 William Mc Millan (Master) deaths at sea within 10 years is co-incidental.
Both he and my grandfather were ship's Masters and my Mother used to say that the ship had been carrying slate, which shifted in a storm, she thought from Ireland but if it was coming from Wales, that might be the case. I'd be interested to know where you're research has taken you. KB