I’ve always loved [name_f]Bonnie[/name_f] and [name_f]Birdie[/name_f] as sisters. They feel like sweet terms of endearment, nickname-ish, warm, familiar. With that in mind, they’d be [name_f]Bonnie[/name_f] [name_f]Helen[/name_f] and [name_f]Birdie[/name_f] [name_f]Louise[/name_f].
[name_f][/name_f]I do think you can use a bit more matchy names, but not to a very matchy degree. I’d do the same that I’d do with twins, where there is a small theme or similarity between each name (say [name_f]Birdie[/name_f] and [name_f]Fern[/name_f] with a nature influence, [name_f]Olive[/name_f] and [name_f]May[/name_f] as word names, [name_f]Beverly[/name_f] and [name_f]Margery[/name_f] with the matching ending). I think [name_f]Bonnie[/name_f] [name_f]Tilly[/name_f] would absolutely work!
[name_f][/name_f]Maybe Marshall’s littlest sibling and Bonnie’s potential [name_m]Irish[/name_m] twin could be named…Clementine, [name_f]Louise[/name_f], [name_f]Mabel[/name_f], [name_f]Dorothy[/name_f], [name_f]Willa[/name_f], [name_f]Pearl[/name_f], [name_m]Franklin[/name_m], [name_m]August[/name_m], [name_m]Otis[/name_m], [name_m]Amos[/name_m], [name_m]Harvey[/name_m], or [name_m]Percy[/name_m].
[name_f][/name_f]If you are having another little one, my gut tells me they’d be a little gal again. 
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