I oftened wondered about that pattern too. My Grandfather and my father (and so do I!) have that same hair pattern, it all seems to swirl to the left. Do we have any idea what this may mean yet? My beautician told me that we all have a pattern that either "swirls" to the left or right naturally.
Well, I have been observing this for years, and I think your beautician is wrong. I see people who have a symmetrical pattern at the back of the neck, with the hair evenly balanced on the right and the left, people with a kind of "widow's peak" down the center of the neck, and people with a swirl to the left or to the right.
When I was in Ireland last month, the left hand swirl (like yours and mine and Kenneth Branagh's) seemed a lot more common than I have seen it anywhere else, but I even saw a few men with it in Russia when I was there.