Heidi \he(i)-di\ as a girl's name is pronounced HYE-dee. Short form of Adelaide or Adelheid (Old German) "exalted nature". Literary: the name of a girl of the Swiss Alps in Johanna Spyri's beloved children's novel "Heidi".
Heidi has 6 variant forms: Haidee, Heida, Heide, Heidey, Heidy and Hydee.
Baby names that sound like Heidi are Hedi and Heddi.