I love
Loretta! It's so homey and comfortable. I prefer
Lottie and
Lettie /
Letty as nicknames.
Loretta fits better with
Rosemary than it does with
Matilda. It would be a delightfully unexpected addition to the set!
In-vogue
Beatrice first comes to mind as a sister for
Matilda and
Rosemary, though I fear its blooming popularity.