There are 3 artists that could be referred as Sonika:
1) Sonika is a Brazilian Band that fuses Alternative Rock and Traditional Genres

2) Sonika is a Bielorussian rock band

3) Sonika is the fifth Vocaloid created by Zero-G. Released on July 14th, 2009, she is the third English speaking Vocaloid to use the updated Vocaloid2 software. She later became the first Vocaloid to be released in Greater China. She is 17 years old. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.