The name "Nio" can refer to several artists:

[1] nIo (new Idol order), a Japanese idol group and a subunit of the larger group Oyayubi Princess. The group is made up of three members, named simply "1", "2" and "3". They perform wearing wrestling masks and often attack cameramen and occasionally fans. nIo's sound is hard rock, often with vocal screaming.
official blog: http://ameblo.jp/new-idol-order/

[2] Nio, now known as Bobby Nio, released the self-written & produced Timbaland-esque grime/electro/soul debut album 'Sumadis', (available on iTunes) through Parapsych Records.
official website: WWW.BOBBYNiO.COM Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.