Agnes was the name of a cool teenager on Gossip Girl- and of a popular model/London "It" Girl - so it might get a pass.
Edith might become popular thanks to the resurrection of
Edie Sedgwick (and her style) in fashion. Or not. Probably just "
Edie". =)
Can't say for
Agatha.
I like all of these names, but I doubt they'll make a huge comeback. Ever.