How about:
Beatrice (Bea)
Josephine (Josie)
Margaret (Maggie)
Winifred (Winnie)
Henrietta / Harriet (Hattie, Hetty, Etta)
Edith (Edie)
Florence (Flora, Flossie)
Mildred / Millicent (Millie, Midge)
Frances (Frankie, Fanny)
Mabel (Mae, Belle)
Agnes (Aggie)
Cecilia (Cece)
Adelaide (Addy, Lady)
Charlotte (Charlie, Lottie)
Eleanor (Ellie)
Genevieve (Gen, Evie)
Bernard (Bernie, Ned)
Edmund / Edward (Ed, Eddie, Ned)
Arthur (Art, Artie)
Wallace (Wally)
Harold (Harry, Hal)
Raymond (Ray)
Frederick (Fred, Freddy)
Sebastian (Seb)
Alfred (Al, Fred, Freddy)
Gordon (Gordy)
Sidney (Sid)
Malcolm (Mal, Mac)
Rupert / Rueben
Hope this helps!