Is a negative a rare blood type?

Blood type. Consists of blood group a, b, ab or o combined with rh factor positive or negative. Lacking this cell surface marker (rh negative), neg folks cannot take blood products from people who are rh positive, as your body will reject them, followed by blood group. Rh negative folks are not rare in number. They are simply more restricted, based on that neg factor, from whom they can receive.
Incomplete info. There are about 30 different blood group systems. Would you please state what blood group are you talking about. If you meant rh negative, about 20% of the population is negative for rh d antigen.