Definitions of nan:

• noun:   leavened bread baked in a clay oven in India; usually shaped like a teardrop
• noun:   a river of western Thailand flowing southward to join the Ping River to form the Chao Phraya
• noun:   your grandmother
• name:  A female given name (rare: 1 in 12500 females; popularity rank in the U.S.: #1021)
• name:  A surname (very rare: popularity rank in the U.S.: #69751)