Related Information for Dweezil Zappa Dweezil Zappa (born September 5, 1969, in Los Angeles, California) is a heavy metal guitarist. He is the son of Gail Sloatman and Frank Zappa and the second of four siblings: his older sister, Moon Unit, and his two younger siblings Ahmet and Diva Zappa.Dweezil's registered birth name was Ian Donald Calvin Euclid Zappa, although this occurred only because the hospital at which he was born refused to register him under the name Dweezil. The name was a nickname coined by Frank for an o.. read more