Tarja Turunen is an ex-member of the band Nightwish before going on TV and playing Doctor Who's female assistant, henceforth being known as Tarja Who?. Tarja is one of many people who have left a famous band and changed their surname to Who, including Mikey Who? from My Chemical Romance and Kaos Who? from the four horsemen of the apocalypse. (There were once five, he left before they became famous.) Tarja recently released a solo album to critical acclaim.