There are several names that could be called out. Falkor, the luckdragon, might have his name called out as he is a friend and helper to Atreyu. Gmork, the wolf, also has his name called out as he is a menacing figure in the story. The calling out of these names helps to drive the plot forward and create the rich tapestry of the neverending story.
In 'The Neverending Story', if a name is called out, it could be a call for help, like when Bastian calls out for someone to save Fantasia. It might also be a way of invoking a particular power or entity within the story's magical realm. The 'neverending' aspect suggests that this act of calling out a name is part of the ongoing, complex tapestry of the story's events.