I also remember reading that N- was a popular letter to put before the nicknames of names that began with vowels. Some are still used and some aren’t.
Examples:
Edward/Edmund -
NedAnn -
Nan,
Nancy Abigail - Nab, Nabby
John Adams had a daughter named
Abigail, known as Nabby, probably to distinguish her from her mother, also named
Abigail.