The surname "Drennan" is of Irish origin, commonly associated with the Gaelic name "O'Draighneain," which means "descendant of Draighnean." It is primarily found in Ireland and among Irish diaspora communities around the world. The name has various spellings, including "Drennan," "Drenan," and "Drennon," reflecting regional variations. Individuals with the surname Drennan may have notable connections in various fields, including sports, academia, and the arts. For example, Drennan is a recognized name in fishing tackle manufacturing, known for producing high-quality angling equipment. The name has also appeared in literature and media, contributing to its cultural significance.