Jesús is a valid and common name for Hispanic males and I don't see how this would disqualify them from being considered for these positions.
Explaining why racism and bias can be rational doesn't mean that I condone racism or bias. Its similar to how companies avoid women who are around 30 because they are likely to get pregnant, that is rational but still isn't something we should celebrate or condone.
Also, I don't see how this behavior can be viewed as rational since we're talking about a research institution here that's supposed to be concerned with scientific excellence hiring the best regardless of their background, and not some road trip with your buddies where you get to pick and choose who will be invited to join you.
I see no rationality in this behavior at all, just outright bias and discrimination.