I would choose from your list…
[name_f]Margot[/name_f] [name_f]Louisa[/name_f]
[name_f]Margot[/name_f] [name_f]Ruth[/name_f]
[name_f]Margot[/name_f] [name_f]Isabel[/name_f]
[name_f]Margot[/name_f] [name_f]Alice[/name_f]
[name_f]Margot[/name_f] [name_f]Eliza[/name_f]
I especially like how the ones starting with vowels give you fun initials and potential nicknames like [name_f]Mim[/name_f], [name_f]Mimi[/name_f], [name_f]Mem[/name_f], [name_f]Emmy[/name_f] and [name_f]Mamie[/name_f].
I like three syllables between [name_f]Margot[/name_f] and you surname so I’ll suggest:
[name_f]Margot[/name_f] [name_f]Annabel[/name_f]
[name_f]Margot[/name_f] [name_f]Valerie[/name_f]
[name_f]Margot[/name_f] [name_f]Eleanor[/name_f]
[name_f]Margot[/name_f] [name_f]Dorothy[/name_f]
[name_f]Margot[/name_f] [name_f]Louella[/name_f]
[name_f]Margot[/name_f] [name_f]Anneliese[/name_f]
[name_f]Margot[/name_f] [name_f]Eugenie[/name_f]
[name_f]Margot[/name_f] [name_f]Julianne[/name_f]
[name_f]Margot[/name_f] [name_f]Elodie[/name_f]
[name_f]Margot[/name_f] [name_f]Emmeline[/name_f]
[name_f]Margot[/name_f] [name_f]Diana[/name_f]