There are multiple artists with this name:
1) Moonchild is an Italian/German gothic rock band founded in 1987 as Wages of Sin. They released six albums between 1993 and 2008. In recent years their style changed from their original goth roots to a more popular kind of rock.
2) Moonchild are an American neo-soul/jazz trio formed at the University of Southern California in LA by Amber Navran (vocals, saxophone), Andris Mattson (trumpet, keys) and Max Bryk (saxophone, keys). Moonchild released their debut album Be Free in 2012 & was signed by UK electronic label Tru Thoughts, who re-released sophomore album Please Rewind in 2015 and third album Voyager in 2017. Influenced by J Dilla, Erykah Badu, D'Angelo, and Flying Lotus, Moonchild's signature smooth sounds have found fans in the likes of Stevie Wonder, Jill Scott, and Jazzy Jeff.
3) Moonchild is an American hardcore metal and rock band produced by John Zorn, featuring Mike Patton & Trevor Dunn of Fantômas. They released four albums between 2005 and 2008. A new Moonchild album was announced for 2010. They are also known as "Moonchild Trio".
4) Moonchild is an Australian house music DJ from Sydney. His first Single "Girl" was released in 2010 on the Vamp Music label.
5) Moonchild is a trance music duo consisting of Graham Simmons and Alun Harrison.
6) Moonchild is a British drum & bass duo consisting of Stephen Kite & Simon Murrell.