This is more a problem with name collisions that "racism" per se. I some white people who share a name with a known criminal, google searching their names comes up with similar results. I also know people who share relatively rare names with well known celebrities which makes it difficult to get their own content to come up in google searches at all.

So this is probably just a reflection of black sounding names to be statistically more likely to be shared with criminals. In the same way that googleing for "teen girls" has a high likelyhood of returning porn.