The name Nan is a girl's name of English origin. Nan and discussed in our forums with posts like "Pick 5 (GIRLS)".
From the experts:
Bobbsey Twins-era nickname name that could find new life via Nan, heroine of The Nanny Diaries. Nan was also the nickname of Annabel St George, the protagonist of Edith Wharton's novel "The Buccaneers".