Hoahio is a female project that was founded by Haco, vocalist and composer for both Happiness Proof and After Dinner. An Italian friend of Haco's is responsible for Hoahio's funny name. This mysterious word was written at the bottom of one of his faxes, and, thinking that it was an onomatopoetic expression in Italian, Haco decided to use it as the group's name. Later, she found out that he had meant to write the Japanese word "ohayo" ("Good morning").