O+ and A+
Generally, there is the ABO blood group system (a, b, or ab), and the rh system (+ or --).
When in different combinations, each person is one of 8 types. The % of each type varies from country to country. But if take the whole world, i believe 0 positive is most common, a positive next most common (about 2/3). Ab negative is the rarest. O-- is the universal donor. Ab+ is the universal receiver.