Why is it called HarfBuzz?

HarfBuzz began its life as text-shaping code within the FreeType project (and you will see references to the FreeType authors within the source code copyright declarations), but was then extracted out to its own project. This project is maintained by Behdad Esfahbod, who named it HarfBuzz. Originally, it was a shaping engine for OpenType fonts—"HarfBuzz" is the Persian for "open type".