There are two bands using this name: 1. The Swedish group EAK (Eld Attack Krossa) was a communist hard rock band from Gothenburg. 2. Eak is also the name of a Portuguese hardcore/metal band. They got a split out on Major Label Industries with Crushing Sun called Bipolar.
Check them out at www.myspace.com/muzeak

Read more about EAK on Last.fm.