The rare and striking given name 'Sullen' is of English origin, derived from the adjective 'sullen', which means sullen or gloomy in appearance or mood. It was used occasionally as a personal name during the Middle Ages but has since fallen out of common use. Today, it is considered an unusual choice for a first name.
"In 2023 alone, seven individuals named Sullen entered the world, bringing the total number of newborns with this unique moniker to seven."