App Namer Expert is a Generative Pre-training Transformer (GPT) designed to aid in the process of app naming. This tool specializes in multilingual, concise app naming which allows developers across various locales to come up with names that can easily transcend language barriers. It optimizes for names that are not only easy to pronounce but also reflect the core objectives of the app in question. The process of using App Namer Expert is interactive, with a welcome interaction inviting the user to share their idea for the perfect app name. To expand upon this, the App Namer Expert GPT provides several example prompts, from a request to generate several globally appealing names for a language learning app, to assistance in brainstorming names for a travel planner app. The user is free to suggest their custom prompts so as to better fit their naming needs. Accessibility to App Namer Expert tool requires a ChatGPT Plus subscription. Brought to life through careful development by Antonio Jose Martinez Sanchez, this GPT tool builds on the ChatGPT platform to provide a specialized service.