The eccentric trailblazer and his wife Gail fell in love after meeting in 1966, and they later became parents to two daughters, Moon Unit and Diva Muffin, and sons Dweezil and Ahmet Emuukha Rodan.
Gail insists the bizarre names all have a special meaning within the family - Dweezil was a pet name which Zappa came up with, while Ahmet was the title of an imaginary butler, and Diva was given her moniker because she was a noisy baby.
Explaining Moon Unit's name, Gail tells Britain's The Times, "He said, 'You can name it Moon or Motorhead.' So of course, I know it's going to be Moon. You know, you're not (truly) related to your partner in life until you have a child together. So we became a family unit and that's the significance of Moon's middle name."
Zappa lost his battle with prostate cancer in 1993 when he was 52.