Characters are able to swim, and World of Warcraft has underwater environments to explore. But beware; your character cannot hold his breath forever. If your breath bar (which appears when you go underwater) gets to zero, then you will drown. Come back up for air and let your character breathe. For any trips across deep water you also need to watch out for fatigue. When you are swimming out in the deep blue sea you can only swim for so long. Make sure you save enough of your fatigue (which appears just like the breath bar) to get back to shallow water or you could drown from exertion.

Can I change the name of my character after creation?

Unfortunately, at this time it is not possible to change the name of your character after creation unless the name violates our naming policies, stated here: In-Game Policies. Although we understand that some players would very much like to have their name changed, it is not a service we offer at this time. If the service is offered in the future, it would be announced on our main website: www.worldofwarcraft.com