And while I'm not too sure of the development history behind PostgreSQL's PL/pgSQL (I suspect Oracle's PL/SQL had influence), the Ada influence necessarily shows there as well.
The previous poster said it could be both, not that it is both. Apparently a lot of people think it is, which is because it's such a commonplace phenomenon.
That it is a person's name is orthogonal to whether it could be an acronym.