Nikki \n(ik)-ki\ as a girl's name (also used as boy's name Nikki), is pronounced NIH-kee. It is of English origin. Short form of Nicole. Nic- and Nik- variants are used in many cultures. Nikki (NEE-kee) is also a Japanese surname probably meaning "two trees".
Nikki has 10 variant forms: Nicci, Nicki, Nickie, Nicky, Niki, Nikia, Nikita, Nikkey, Nikkie and Nikky.
For more information, see also the related name Nicolette.