* Something literal: The Academy of Higher Learning, The Stellar Institute of Technology, The Xylos University.
* Something evocative: Whispering Pines College, Ironclad Academy, The Obsidian Spire.
* Something based on the world's language: You could invent a language and give it a name that sounds appropriate to that language's phonetics.
* Something metaphorical: The College of Shifting Sands, The Crucible of Knowledge, The Celestial Conservatory.
To get a more specific answer, you need to tell me more about the fictional world! What's its culture like? What is the technology level? What are its values?