The Christmas song with joy, joy, joy is a German hymn translated into English, How Great Our Joy.
Joy Down In My Heart
The text says "While fields and floods, rocks, hills and plains repeat the sounding joy." So I would say that its the earth, or more specifically the fields, floods, rocks, hills, and plains...
Stimpy
Josh Joy loves u and me. He's a great big family. He loves Barney and teletubies