Scooby-Doo's full legal name is Scoobert Doo.

The name Scoobert was first confirmed in the 1980s during the Scooby-Doo and Scrappy-Doo series. It appeared again in the 2002 live-action film and the 2010 series Scooby-Doo! Mystery Incorporated. In the episode The All-American Pooch, his full name is written on official papers.Scooby has a large family tree with many relatives. His parents are named Dadee and Mommee Doo. He has several siblings including Skippy-Doo, Howdy-Doo, and Ruby-Doo. Ruby-Doo is the mother of Scooby's nephew, Scrappy-Doo.The name Doo acts as a last name for the whole family. This is rare for cartoon animals. It helps the show treat Scooby like a person and a full member of the team. The name Scoobert sounds like real human names like Hubert or Norbert.The gang rarely uses his full name. They usually only say it when they are being very formal or precise. This detail gives the character more history and a clear identity.