He went missing on Monday night as he made his way back to his hotel in Koh Samui.
It is understood David’s two older brothers, Jonathan and Paul, flew to the island on Tuesday to join the search for their missing sibling whose body was found yesterday.
The Department of Foreign Affairs said it is aware of the case and is providing consular assistance to the family. David, a former student of Dungarvan CBS and Waterford Institute of Technology, was said to have had a keen interest in sport and was a member of the Dungarvan GAA club.
PJ Ryan, chairman of Waterford GAA, said the young man was from a strong sporting background.
“He was a young man, hugely interested in sport. All his family, his uncle, his aunts, all belonged to him had a huge interest in sport, especially Gaelic games and David was no different,” he said.
The club has suspended all activities and invited mourners to gather at the club to support each other during “this tough time”.