There are multiple artists using the name Castaway;

1) A melodic hardcore / punk band from Tokyo, Japan. https://castawayjp.bandcamp.com/

2) Pop/Punk band from Saskatchewan. https://www.facebook.com/CastawaySaskatchewan http://castaway306.bandcamp.com/album/living-room-sessions-3

3) Progressive Death Metal band from Florida who have released 4 albums and one demo (http://www.myspace.com/castawaytheband).

4) A melodic hardcore band from Brisbane, Australia. Castaway have released a demo in 2009, followed by a six track self-titled EP in March 2010. (http://www.myspace.com/castawayau)

5) A Hardcore band from Bandung, West Java, Indonesia. Born on, October 2010 who have released their 1617 EP album in 2013. http://www.battleofthebands.com/u/castawayhc