Boy is a name of at least 5 artists:

1) A Swiss–German pop duo founded in 2007 by Swiss singer Valeska Steiner (aka Valeska) and German bassist Sonja Milena Glass. They are based in Zurich and Hamburg. Their début album was “Mutual Friends” (2 Sep 2011, Grönland).

Sites: MusicBrainz, Facebook and MySpace

2) A Czech punk rock band from Brno. The band consists of Martino (vocal), Kelso – (guitar/vocal), Olda (guitar/vocal), Rob (bass/vocal) and Vinca (drums).