Who created Emma?

Chris Claremont and John Byrne created Emma Frost and the Hellfire Club in 1979 with a January 1980 cover date, all of whom were based off the 60s Avengers TV show (not related to Marvel). Emma's name was taken from the character Emma Peel in the show, while Jean Grey's role in the Dark Phoenix Saga was influenced by Peel's character arc where she was forced into becoming the Queen of Sin.
Comics Should Be Good confirmed the rumor about the HFC's relation to the TV show in their article.