Dutch short form of Johannes or Johanna.This name can also be a short form of names that contain the Germanic element nand meaning "brave", such as Ferdinand and Nanthild. This particular etymology applies to both Dutch and Frisian.
From Chinese 男 (nán) meaning "man, male, son", 南 (nán) meaning "south" or 楠 (nán) meaning "Chinese cedar", as well as other characters that are pronounced similarly.