Nada Inada (なだ いなだ; 8 June 1929 – 6 June 2013) was the pen-name of a Japanese psychiatrist, writer and literary critic active in late Shōwa period and early Heisei period Japan. His pen name is from the Spanish language phrase "nada y nada".
Source: “Nada Inada”, English Wikipedia (CC BY-SA 4.0), excerpt