The term normal was actually coined by Karl E. Pearson, as there there was international disagreement about the naming of the Laplace-Gaussian (or Gaussian-Laplace) distribution. "Normal" also doesn't mean "usual", and is a mathematically construct.
The problem with the default person is actually that there are minor genetic differences between different ethnicities. This means that certain medical conditions are more prevalent in some ethnic groups than others (for example lactose intolerance) and this is not accounted for by assuming a normal distribution, or "a default person".
I don't think it was Pearson who coined the name. Wikipedia dates it back to 1875, when Pearson was 18. Its more likely (to me), that its use grew organically, and is associated with Pearson because of his influence.
> this is not accounted for by assuming a normal distribution
Often, groups with different averages produce a normal distribution when combined. So it may be the right distribution, but not the proper conclusion.
The problem with the default person is actually that there are minor genetic differences between different ethnicities. This means that certain medical conditions are more prevalent in some ethnic groups than others (for example lactose intolerance) and this is not accounted for by assuming a normal distribution, or "a default person".