What is a government name?

"Prosecutors said the private aircraft didn’t have an assigned flight number, and Dugg’s government name wasn’t listed on the flight’s passenger manifest."
https://www.yahoo.com/entertainment/prosecutors-42-dugg-claimed-sovereign-021203811.html

"pronounced: "gov'mint"
someone's actual name recognized by the government, and on official ID."
https://www.urbandictionary.com/define.php?term=government%20name

"One's (partial or full) legal name , as opposed to one's nickname or street name ; one's government-recognized name."
https://www.yourdictionary.com/government-name