The Neverending Story focuses mainly on the adventures of Bastian and the fantastical world of Fantasia. There isn't a character known as 'Mom' with a particular name that stands out in the story. It's more about the journey of the boy within the magical realm rather than about a character named 'Mom' having a named presence.
Well, it's hard to say for sure. There could be names like 'The Endless Adventure' or 'The Perpetual Storyline'. Different authors or works might give it various names to convey the idea of never-endingness.
The name of a horse in 'The Neverending Story' might be a symbol. It could symbolize a certain concept or value in the story's world. For instance, a horse named 'Hope' could be a source of inspiration for the characters. Or it could be a way to connect with the magical elements of the story. A name like 'Starlight' might suggest a connection to the otherworldly or celestial aspects of the Neverending Story.