Some of my favourites off the top of my head:
Isadora "
Sadie"
Evadne "
Edie"
Rosemary "
Molly"
Madalena "Mena"
Guinevere "Viv"
Eloise "
Elsie"
Eloisa "
Elsa"
Susannah "
Zsazsa"
Edmund "
Eder" (
Edmund's been on my list since grade 3, and I found
Eder over the summer looking through Basque names. It only just occured to me to use both. Why not? They're not pronounced the same, but I hate
Edmundo and if I'm to live in Spain for the rest of my life,
Eder would be pronounced right and would get rid of my problem with
Edmundo)
Ambrose "
Amos"
Balthazar "Baz"
Bertram "
Bram"
Sebastián "Sebas"
From your list, I absolutely adore
Josephine "
Posy" (that is ADORABLE!), and I like
Margaret "
Margot" or "
Greta",
Josephine "Sephie", and "
Nell" (but not so much
Penelope).