[name_u]Rylee[/name_u] comes across to me as a fun, fresh and modern (and unisex) name so I would go for something similar. From your list, I like [name_u]Piper[/name_u] [name_u]Jean[/name_u] best - and it also means you get PJ as a nickname option in addition to Pip/Pippi etc. (I know a PJ whose family called her Peej that then led to [name_f]Peach[/name_f] and now she’s Peach!)
Otherwise [name_u]Harper[/name_u] or [name_f]Kaia[/name_f] - maybe [name_u]Harper[/name_u] [name_f]Elizabeth[/name_f] or [name_u]Harper[/name_u] Sadie; [name_f]Kaia[/name_f] [name_u]Jean[/name_u] or [name_f]Kaia[/name_f] [name_f]Christine[/name_f] (“Kiki”). [name_f]Nola[/name_f] could work too, [name_f]Nola[/name_f] [name_f]Christine[/name_f] is pretty. I think [name_f]Abigail[/name_f] goes too if you want a more traditional name - [name_f]Abigail[/name_f] [name_f]Sadie[/name_f]?
Not as keen on [name_f]Lily[/name_f] as (to me) sounds a bit cutesy with [name_u]Rylee[/name_u] and also different spelling of the same sound (eg why not Lilee -I get why, but just as an eg). I also think it might hem you in a little if you’re having any additional children with the repeat ending - same for [name_u]Charlie[/name_u]. I do like the name though. Only name I’m not a fan of on you list is [name_f]Brynn[/name_f] - it goes with [name_u]Rylee[/name_u], but it’s quite harsh to my ear - and I myself would only use [name_u]Charlie[/name_u] as a nickname.
Other names you might like with [name_u]Rylee[/name_u]: [name_u]Cleo[/name_u], [name_u]Sloane[/name_u], [name_f]Maisie[/name_f], [name_u]Harlow[/name_u], [name_f]Gemma[/name_f], [name_u]Auden[/name_u], [name_u]Fern[/name_u], [name_u]Delaney[/name_u], [name_f]Keira[/name_f], [name_u]Sutton[/name_u], [name_f]Tess[/name_f], [name_u]June[/name_u], [name_f]Meadow[/name_f], [name_f]Cora[/name_f], [name_u]Morgan[/name_u], [name_u]Seren[/name_u], [name_u]Eden[/name_u], [name_f]Brea[/name_f], [name_u]Darcy[/name_u], [name_f]Avalon[/name_f], [name_f]Nora[/name_f], [name_u]Hazel[/name_u], [name_u]Arden[/name_u], [name_u]Shiloh[/name_u], [name_u]Adair[/name_u], and [name_f]Zara[/name_f].