Firstly, I love your son’s name! [name_m]Archer[/name_m] [name_m]Findlay[/name_m] is grounded & handsome, with a playful undertone. [name_f]Winnie[/name_f] could work wonderfully as a sister – maybe as a nickname for [name_f]Winona[/name_f], [name_f]Winslet[/name_f], [name_f]Gwen[/name_f] (or variations like Gwendolyn), [name_f][/name_f] [name_f]Bronwen[/name_f], [name_f]Olwen[/name_f], or [name_m]Rowan[/name_m], but she could totally work as a standalone as well!
[name_f][/name_f]A few other suggestions you might like, apologies for any repeats:
[name_f][/name_f][name_f]Millie[/name_f]
[name_f][/name_f][name_f]Lottie[/name_f]
[name_f][/name_f][name_f]Goldie[/name_f]
[name_f][/name_f][name_f]Enid[/name_f]
[name_f][/name_f][name_f]Greta[/name_f]
[name_f][/name_f][name_f]Bridget[/name_f]
[name_f][/name_f][name_f]Tessa[/name_f]
[name_f][/name_f][name_f]Libby[/name_f]
[name_f][/name_f][name_f]Lilah[/name_f]
[name_f][/name_f][name_f]Hadley[/name_f]
[name_f][/name_f][name_m]Rory[/name_m]
[name_f][/name_f][name_f]Mavis[/name_f]
[name_f][/name_f][name_f]Leonie[/name_f]
[name_f][/name_f][name_f]Phoebe[/name_f]
[name_f][/name_f][name_f]Olive[/name_f]
[name_f][/name_f][name_f]Scout[/name_f]
[name_f][/name_f][name_f]June[/name_f]