I really like the suggestion of [name_f]Nell[/name_f] [name_f]Josephine[/name_f]! That might be my favorite. Other thoughts:
[name_f]Nell[/name_f] [name_f]Caroline[/name_f]
[name_f]Nell[/name_f] [name_f]Beatrice[/name_f]
[name_f]Nell[/name_f] [name_f]Julia[/name_f]
[name_f]Nell[/name_f] [name_f]Virginia[/name_f]
[name_f]Nell[/name_f] [name_f]Margaret[/name_f] or [name_f]Marguerite[/name_f]
[name_f]Nell[/name_f] [name_f]Victoria[/name_f]
[name_f]Nell[/name_f] [name_f]Adelaide[/name_f]
[name_f]Nell[/name_f] [name_f]Emmeline[/name_f]
[name_f]Nell[/name_f] [name_f]Susannah[/name_f]
[name_f]Nell[/name_f] [name_f]Rebecca[/name_f]
[name_f]Nell[/name_f] [name_f]Matilda[/name_f]
I adore [name_f]Nell[/name_f]! Though I would use the full name [name_f]Helena[/name_f] because it honors family. I really like [name_f]Nell[/name_f] [name_f]Dorothea[/name_f] or [name_f]Nell[/name_f] [name_f]Marguerite[/name_f] - both sound so sophisticated and elegant.