Those named K strike out

The WSJ Numbers Guy writes:

For example, major league baseball players with first or last initial K were more likely than average to strike out; and business graduate students with initials C or D had lower grades, on average, perhaps reflecting an unconscious affinity to the grades corresponding to their initials.

There have been a lot of other studies that have found correlations with names and birth dates. This sounds like astrology to me. If these studies are correct, then it seems possible that astrological signs could have some significant correlations.