For me, March is the month of birthdays. In my circles, an October birthday seems to be rare and I've never even met someone with my same birthday (October 4). But March has a crazy number of birthdays; February through April probably accounts for half of the birthdays among people I know. Shannon shares her birthday (March 4) with half a dozen people I know.
March birthdays I have to keep track of: my wife, two kids, three in-laws, an uncle, a cousin, a nephew, a niece, and several friends, and I'm probably forgetting some (that's just off the top of my head). Thank goodness for Facebook and calendar apps and such that will remind me of all the others.