Claim: Megumi Hinata, a Japanese singer,  had her singing debut in 1998 as GUMI (グミ)  and changed her solo stage name to Meg Rock in 2004.
Evidence: Megumi Hinata (日向めぐみ, Hinata Megumi) is a Japanese singer, lyricist, composer and musician. Under the direction of Kohmi Hirose, Megumi Hinata had her singing debut in 1998 as GUMI (グミ) and sang the theme song and several insert songs for the immensely popular Card Captor Sakura anime. She changed her solo stage name to meg rock in 2004.