Ei is both a surname and a given name. Notable people with the surname include:
People with the surnname
- Ei Ei (born 1965), Burmese singer
- Ei Ei Thet (born 1992), Burmese swimmer
- Ei Chaw Po (born 1990), Burmese actress, model and singer of Mon descent
- Poe Ei Ei Khant (born 1993), Burmese actress and singer
People with the given name
- Ei-Q (born 1973), Japanese artist
- Ei Aoki (born 1965), Japanese storyboard artist
- Ei Iida (born 1967), Japanese former professional tennis player
- Ei Hisatora (1558–1587), Japanese samurai of the Sengoku period
- Ei Ogawa (1930-1994), Japanese screenwriter
- Rokusuke Ei (1933–2016), Japanese lyricist, composer, author, essayist
- Shō Ei (1559–1588), Japanese king of the Ryukyu Kingdom
- Wada Ei (1857–1929), Japanese textile worker and memoirist