The idea that people might inadvertently be drawn to careers related to their names. Sort of the opposite of someone with a surname of Baker because the family was once bakers, and instead suggesting that, if you are called Baker, you might unknowingly gravitate towards a career in baked goods.
Apparently coined in the New Scientist by reader C. R. Cavonius after people kept submitting examples, including those in the sketch. More examples here.
HT: Chris Hey
A few more:
Les McBurney — Volunteer firefighter
Dr. Lauren Hyman — Gynecologist
Dr. Chip Silvertooth — Dentist
Paul Schwinghammer — Contractor