Sibling for Jamilah

My daughter is [name_f]Jamilah[/name_f] (Ja-Mee-La, goes by “[name_f]Mila[/name_f]”) and we need help with names for her new little brother or sister! Here’s what we’re considering…

For a girl:
[name_f]Maida[/name_f] [name_f]Emerald[/name_f] - Are “[name_f]Maida[/name_f] & [name_f]Mila[/name_f]” too similar for sisters?

For a boy:
[name_m]Walden[/name_m] (nn [name_m]Walt[/name_m]) [name_m]Quest[/name_m] - I love the name but it seems like an odd sibling name set?