Often, names alone wouldn't necessarily constitute a violation as names are generally not sufficient to count as personally identifiable information... but a name like 'Bobby Null' is, I think, quite unique.
When I was being trained on HIPAA compliance I was told that sole first names are generally perfectly fine, and sole last names can often be fine but should be avoided for very common names. But I should also say that I am not an expert on HIPAA compliance.
All the post tells us is that a person named "Bobby Null" exists and has medical records, as do most people. It doesn't say anything about this persons medical issues/history at all.
I could learn more about someone by sitting a touch too close to the reception area at a doctor's office.
A name by itself, you are quite right, is not PHI. Thanks for the reminder!