A good overview about this including references is given by
Does blood type affect vocational behavior? by Andrew D. Carson, Ph.D.
In summary it states that an influence of the blood type on the behavior can not be fully dismissed out of hand, but there are also research results which did not found any connection.
Except: (emphasis mine)
There have been a number of studies over the years testing relationships between blood type and personality, and the following brief review is illustrative rather than definitive. I provide this review purely to demonstrate that claims of a relationship between blood type and personality should not be dismissed out of hand. Early published reports (Koga & Kato, 1934; Thompson, 1936) in general found no relation between blood type and personality traits or abilities.
However, more recent research has tended to find some linkages. Rinieris, Stefanis, and Rabavilis (1980), in a large (N=600) study of normal individuals, found greater incidence of obsessional personality traits in blood types A, B, and AB than in type O. In a study of 137 graduate students, Marutham and Prakash (1990) found Type B individuals to have higher neuroticism scores (compared to types O and A) on the Eysenck Personality Inventory; there were no differences on either extraversion or Type A behavior pattern. In a small study of individuals with duodenal ulcers, Neumann, Shoaf, Harvill, Jones, and Edward (1992) reported that Type A individuals had higher trait anger, trait anxiety, and depression compared to Type O individuals on standard measures of personality.
If there are indeed relations between blood type and personality, then it is not impossible that there may also exist differences in typical blood type across occupations, and that some blood types are associated with greater performance or resistance to occupational stress than are others within given occupations. In other words, it may be possible to apply a person-environment fit theory of work using blood type as a person-attribute. However, I recommend a more thorough literature review, followed by empirical research directly testing this notion before engaging in further speculation along these lines.
I also found an journal paper which claimed a (small?) relationship between blood type and personality:
Blood Groups and Personality Traits, by R. B. CATTELL, H. BOUTOURLINE YOUNG, AND J. D. HUNDLEBY, published in the AMERICAN JOURNAL OF HUMAAN GENETICS, VOL. 16, No. 4 (DECEMBER), 1984.
The High School Personality Questionnaire, Form A (10 items per factor)
was given to 581 Italian or Italo-American boys averaging 14 years of age in
four different cities. They were also classified for ABO types. Analysis of
variance was used to detect associations between ABO type and the 13 personality
factors and intelligence.
An association beyond the P < .01 level was found for I factor, premsia vs.
harria ("tender-minded vs. tough-minded"), A blood type being more premsic,
and 0, B, and AB more harric, in that order. A relationship which appeared
to warrant further investigation was personality factor J, coasthenia, with
blood group AB.