I adore your kids names! [name_m]Teddy[/name_m] & [name_f]Mara[/name_f] are so darling together 
From your list, I’m really loving [name_m]Harrison[/name_m] [name_f]Jean[/name_f] [name_m]Christophe[/name_m] “Sonny” & [name_m]William[/name_m] [name_f]Jean[/name_f] [name_m]Christophe[/name_m] (though I’d probably opt for a nickname like [name_m]Wilkie[/name_m] / [name_m]Wiley[/name_m]) for boys, and [name_f]Mariella[/name_f] “Ella” (maybe [name_f]Mariella[/name_f] [name_f]Blanche[/name_f] [name_f]Rose[/name_f]? or [name_f]Mariella[/name_f] [name_f]May[/name_f] Lian?) for a girl!
A few other suggestions you might like:
[name_m]Augustine[/name_m] “Gus”
[name_m]Tobias[/name_m] “Toby”
[name_m]Edward[/name_m] “Ned / Eddie”
[name_m]Frederick[/name_m] “Freddie”
[name_m]Sebastian[/name_m] “Sebby / Bastian”
[name_m]Laurence[/name_m] “Lenny / [name_m]Leo[/name_m] / Ren”
[name_m]Graham[/name_m] “Gray”
[name_m]Lionel[/name_m] “Lenny / Leo”
[name_m]Gilbert[/name_m] “Gibb / Bertie”
[name_m]Bernard[/name_m] “Bear / [name_m]Barry[/name_m] / Bernie”
[name_f]Marietta[/name_f] “Etta”
[name_f]Marilyn[/name_f] “Meryl”
[name_f]Marlene[/name_f] “Marnie / [name_f]Molly[/name_f] / Leni”
[name_f]Marceline[/name_f] “Celia / [name_f]Missy[/name_f] / Cece”
[name_f]Marybeth[/name_f] “Beth / [name_f]Betty[/name_f] / Mimi”
[name_f]Meredith[/name_f] “Edie”
I hope this helped spark some inspiration!