In my story (go to see What evolutionary pressures would lead to Ogres?), there is a massive species from the Homo genus called ogre. They mostly have B negative blood type (I do not mean Rhesus null, but the simple absence of D antigen).
Precisely, 60 % of ogres are Rhesus negative, and 40 % are Rhesus positive. Also, 35 % of ogres are B, 25 % are A, 30 % are O, and 10 % are AB. Finally, 20 % of ogres are B negative, 15 % are B positive, 16 % are A negative, 9 % are A positive, 18 % are O negative, 12 % are O positive, 6 % are AB negative, and 4 % are AB positive.
In real life, most humans are O positive. That said, it depends of the ethnicity, and the region. For example, according to Héma-Québec (sorry, I live in Quebec), 85 % of Quebec's human population are Rhesus positive, and at the opposite, 15 % are Rhesus negative. Also, 46 % of Quebec's population are O, 42 % are A, 9 % are B, and 3 % are AB. Finally, 39 % of Quebec's population are O positive, 36 % are A positive, 7.5 % are B positive, 7 % are O negative, 6 % are A negative, 2.5 % are AB positive, 1.5 % are B negative, and 0.5 % are AB negative.
Also, according to Wikipedia, at 46.3 % of its human population, Armenia wins the world record of the country with the most citizens who are A positive. At 33.12 %, Bangladesh is the only country I know with humans who are mostly B positive. But, in India, there is an almost even number of humans who are O positive and humans who are B positive, at 32.53 % and 32.1 % respectively.
So, I wonder why would a species from the Homo genus benefit evolutionary speaking to mostly have B negative blood type.