What does Oni mean?
Oni is an unusual given name for women. Oni is an equivalently uncommon surname too for all people. (2000 U.S. Census)
Below is a graphed analysis of the popularity of the girl name Oni and affiliated names. Anna (#34 a year ago), Ana (#222), Nina (#295), Annie (#311), Anya (#472), Anika (#519), Anne (#553), Hana (#841), Ann (#945), Onie, Nona, Nonie, Nanci, Annis, Anita, Aine, Nan and Nana are the prominent variation forms of Oni (#unlisted) appearing in the Top 1000. This girl name reached the height of its popularity during the years 1880-1889 and has become significantly less popular since, with versions like Ann, Anne, Hana, Nona and Nonie falling out of style. Anika (#519), Ana (#222) and Anya (#472) are three of the more fashionable girl names in this compilation, with Ana enjoying a revival in popularity. (2014 Birth Statistics)