Ni is the Mandarin pinyin and Wade–Giles romanization of the Chinese surname written 倪 in Chinese character.

It is romanized Ngai in Cantonese.

It is romanized as "Geh" in Malaysia and Singapore, and "Ge" in Indonesia, from its Minnan / Hokkian pronunciation.

Ni is listed 71st in the Song dynasty classic text Hundred Family Surnames.

[1] As of 2008, it is the 116th most common surname in China, shared by 1.4 million people.