I think if you spell it Jerryd, its more likely they'll get Jerry as a nick name, so if you are happy with that? As a another alternative spelling, a friend of mine is Gerrard (with two r's rather than one). Jerryd definatley looks more modern, however I imagine you may have to get used of some people spelling it incorrectly.

BTW - good luck on the 12th, I'm due that day too