There are at least 4 artists with this name.

1) is an electronic brony musician and singer. https://twitter.com/koapony

2) is a Spanish electro producer.

3) is a Hawaiian pop-rock band led by Koa Siu.

4) is a Czech folk band. The band for first formed around Zuzana Navarová d.T. and after her tragic death continued to perform with new repertior. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.