Are people aware of who Naruto's parents are? Every villager in Konoha is aware that Naruto has the Kyuubi sealed inside of him.  

Is anyone in the village or elsewhere (other than Kakashi and Jiraiya, that I remember knew) aware that he is the son of Minato and Kushina?
My main doubt being: do they know that he is the son of the Fourth Hokage?
Most of them didn't know. It was a secret to protect Naruto. Just a few people knew it. I found proof on this site:


  Suddenly orphaned, Naruto was left to grow up knowing nothing of his parents, receiving only his mother's last name because the Third Hokage thought that it was best that nobody knew that he was related to the Fourth Hokage.


They found it here: Naruto chapter 440, page 5