There is no information provided to generate a Celtic name from "Romy." The prompt only gives a name, not the preferences needed by a Celtic name generator (gender, meaning, region, sounds, etc.). To get a Celtic name related to "Romy," additional information is required. A user would need to specify how "Romy" should influence the name generation (e.g., "Generate a female Celtic name that sounds similar to Romy," or "Generate a Celtic name with a similar meaning to the name Romy," assuming a meaning for Romy is known).