Dai is a Welsh masculine given name, a diminutive form of Dafydd (David), as well as a masculine Japanese given name. Notable people with the name include:
Dai Davies (footballer, born 1880)
Dai Davies (footballer, born 1948)
Dai Davies (politician)
Dai Greene, a British hurdler
Dai Henwood, New Zealand comedian
Dai Matsumoto, Japanese voice actor
Dai Nagao, Japanese composer, musician and producer
Dai SatÅ, Japanese screenwriter and musician
Dai Ward, Wales international footballer
Dai Young, Wales international rugby union player
Fictional characters:
Dai Greatcoat, a character from David Jones' In Parenthesis
Dai Takabayashi, a fictional character from the anime series Super Doll Licca-chan.
Dai Blackthorn, a role-playing character from the RPG GURPS.
