I love your girls list!
Your list:
[name]Penelope[/name] - I love it! [name]Just[/name] worried about how popular its getting.
Talulah or [name]Talula[/name] - I love it.
[name]Daphne[/name] - I love it.
[name]Mathilda[/name] - I love it, especially with the nickname [name]Tillie[/name]. 
[name]Estelle[/name] - l also love it. 
[name]Priscilla[/name] - Like it, but it does sounds too prissy.
[name]Louella[/name] or [name]Luella[/name] - Not a fan.
[name]Chandler[/name] - I love this for a girl! 
Not too big on your boys though.
Your list:
[name]Thatcher[/name] - [name]Kinda[/name] like it.
[name]Thor[/name] - Hate it.
[name]Thornton[/name] ([name]Thor[/name] for short) - Reminds me of [name]Horton[/name] from Dr. Seuss.
[name]Fletcher[/name] - I like it.
[name]Satchel[/name] - Reminds me of the character from the comic book Get Fuzzy.
[name]Roger[/name] - Not a fan.
My suggestions:
Girls -
[name]Annika[/name],
[name]Anniston[/name],
[name]Alice[/name],
[name]Alessandra[/name],
[name]Amabel[/name]/[name]Campbell[/name],
Aracilla,
[name]Lucille[/name] “[name]Lucy[/name]”,
[name]Aurora[/name] “[name]Rori[/name]”,
[name]Belle[/name],
[name]Briar[/name],
[name]Briar[/name]-[name]Rose[/name],
[name]Aster[/name],
[name]Bryce[/name],
[name]Cara[/name],
[name]Jewel[/name]/[name]Jule[/name],
[name]Cecilia[/name]/[name]Cecelia[/name] “[name]Cece[/name]”,
[name]Lavinia[/name] “[name]Vinnie[/name]”,
[name]Sawyer[/name],
[name]Spencer[/name],
[name]Marilyn[/name],
[name]Pearl[/name],
Pherris/[name]Phyllis[/name],
[name]Vittoria[/name] “Vittie”,
[name]Viola[/name].
Boys -
[name]Percy[/name] - Persues or [name]Percival[/name],
[name]Cesar[/name],
[name]Cedric[/name],
[name]Crispian[/name],
[name]Jude[/name],
[name]Jasper[/name]/[name]Casper[/name],
[name]Mica[/name]/[name]Micah[/name],
[name]Declan[/name],
[name]Jacoby[/name],
[name]Leopold[/name] “[name]Leo[/name]”,
[name]Wendell[/name],
[name]Quinton[/name].