Hypothetical sibset

Right, I have this sibset in my head and wanted some feedback on how well they work together and middle name suggestions for them:

[name_u]Penny[/name_u]
[name_f]Naomi[/name_f]
[name_f]Lilith[/name_f]
[name_m]Zachary[/name_m]
[name_m]Alexander[/name_m]
[name_m]Malachi[/name_m]

Middle names we like include: [name_u]Lynn[/name_u], [name_f]Sarah[/name_f], [name_f]Heather[/name_f], [name_f]Freya[/name_f], [name_f]Thalia[/name_f], [name_m]Michael[/name_m], [name_u]James[/name_u], [name_m]Matthew[/name_m] and [name_m]Ezio[/name_m].