What do the number on new jersey drivers license mean?

The first letter is obviously your last name - the next 4 numbers after the letter is an encoding system for your last name- everyone with the same last name will have the same 4 encoded numbers or digits -

The next 5 numbers are an encoding system for your first name (a 3 digit code) and then a (2 digit code) for your middle initial

The Last 5 numbers are a weight class (1st digit)-no longer published on the DL, the month (2nd digit)-sometimes includes the first digit, and year (3rd &4th digits) of the persons birth and the last number (5th digit) is the color of the persons eyes