My mother is an Elisabeth, and her nickname is Bobbie. This came about because there were something like 15 Elisabeths in her class and they were almost all called "Betty" or "Lizzy" at home. So her teacher put every possible nickname for Elisabeth in a hat, and they picked. Betty, Beth, Betsy, Liz, Lisbeth, Lizzy, Lisa, Liza, Eliza, Elise, Ella, Ellie weren't enough so they had to get creative and she wound up with Bobbie. I know someone named Anne Howe (she married a man named Howe) and someone named Mary Mee (married a man named Mee).