Maserati is an Italian car brand. The cars are expensive sports cars, known for looking stylish and going very fast. People say the name when they mean “a rich person’s fast car,” the way they might say Ferrari. It began as a family name — the Maserati brothers — and we keep the Italian name in English; we do not translate it. You write it with a capital M because it is a name. You hear it in ads, films, and talk about money and status, not in a science lab.