Daisy, Violet, Poppy, Elsa, Megan, Nancy, Amber and Florence are all good names, but not unusual. I know at least 3 of each. Definitely more Harry than Archer.
Mabel, Dorothy, Dulcie, Ivy, Dana, Iris and Esther are all in the old lady chic category. I don't like any of them and they're very 'of the moment'.
Sorrel and particularly Briar are both terrible. Both far more 'quirky' than Archer.
Polly, Margot, Romily, Eliza and April are in the 'mainstream, but underused' category, which is nice. I like April best.
Wren, Sage, Willow, Lila, Lyra, Juniper, Lavender and Ailsa are all in the 'we're trying desperately to give our DC a quirky name' category, which is probably the same category that Archer falls into. I like Wren and Lavender best.
My favourite from your list are; Violet, Florence, April, Wren and Lavender.
Jack, Ted, Stanley, Wilfred, Oscar and Owen are all good names, but again not unusual. I know at least 3 of each (about 15 Jacks!). I like Owen a lot. I also like Jackson, which is a bit more unusual and surnamey like Archer is.
Sidney and Chester are old man chic. I don't like either.
Digby and Monty are fab as long as the baby is a puppy. If it's likely to be a human I would avoid.
Austin, Rafferty and Rowan are in the 'mainstream, but underused' section. I like Austin and love Rowan (although I like it more for a girl).
Forrest and Fox are too 'trying to be quirky' for my taste.
My favourites from your list are; Jack/Jackson, Owen, Oscar, Austin, Rafferty and Rowan. I probably wouldn't use Austin with Archer though because they're quite similar.