I like [name_f]Delphine[/name_f] or [name_f]Cosette[/name_f] best from your list.
[name_f][/name_f]Other ideas:
[name_f][/name_f][name_f]Lydia[/name_f] [name_f]Beatrice[/name_f]
[name_f][/name_f][name_f]Lydia[/name_f] [name_f]Christine[/name_f]
[name_f][/name_f][name_f]Lydia[/name_f] [name_f]Constance[/name_f]
[name_f][/name_f][name_f]Lydia[/name_f] [name_f]Genevieve[/name_f]
[name_f][/name_f][name_f]Lydia[/name_f] [name_f]Gwendolyn[/name_f]
[name_f][/name_f][name_f]Lydia[/name_f] [name_f]Imogene[/name_f]
[name_f][/name_f][name_f]Lydia[/name_f] [name_f]Katherine[/name_f]
[name_f][/name_f][name_f]Lydia[/name_f] [name_f]Ruth[/name_f]
[name_f][/name_f][name_f]Lydia[/name_f] [name_f]Vivienne[/name_f]