Brennan is a common given name and surname of Irish origin. It is derived from the Gaelic name Braonán, which means "descendant of Braon," a personal name that is believed to mean "sorrow" or "sadness." The name is often associated with various notable individuals, including politicians, athletes, and artists. In addition to being a name, Brennan can refer to several places, such as Brennan, Texas, a small community in the United States. The name is also used in various businesses and organizations, reflecting its popularity and versatility in different contexts.