Marley will only use our names if she wants something...to get our attention. She is almost 14 months old now. She has no other words, but communicates very well and understands exceptionally well too. She is very expressive but is much slower than Charlotte was with speech.
If you are concerned I would speak with your paed, but I am trying not to worry until she is 2. I remember Charlotte had a very significant language leap when she turned 2.