Gosh… Gielle (Austin’s ex wife) put it on her Tumblr that they thought that if they had a daughter they would name it Kennedy or Marlee after their mothers. I could send you the link, but I do not want to look through Gielles tumblr archive. I used to have it saved, but not anymore, obviously, and I am not sure if it is on this blog or not.
So, if you really want to ‘have a source/link’ look at her tumblr archive, giellelovee.tumblr.com/archive, and there will be an ‘ask’ message somewhere about it. Look back from the begging of her tumblr (2010).