The fact that my daughter crawls (belly down) makes some things in life easier. For example, I can go into the kitchen, and a few moments later, she appears. This means I don't have to carry her every where (just most every where).
Yesterday I popped into the kitchen, and could hear her scooting my direction, and expected her little head to pop around the corner any moment. And then everything was silent. People who know children know that silence is not golden, that's only when children are asleep, when they're awake, it's a danger sign. So I started to call her name, to distract her from whatever was holding up her progress. I called it two or three times with no response, and then, just before going to check on her I called out "ehh!" which is her favorite sound. She piped back "ehh!" started moving, and soon came around the corner.
So she doesn't know her name just yet, but she does know sounds that mean we're talking to her.