Messages under wife's name
My wife and I each have iPhone 4s with different mobile numbers. She has a MacBook Air and I have a MacBook Pro. When I send an iMessage on my MacBook Pro to another with iMessaging, the message shows that it is from my wife, not me. What do I need to do to correct this so the message reflects it is from me?
MacBook Pro, OS X Mountain Lion (10.8.2)