Sullivan is a common surname and can refer to various individuals, places, or entities. One notable figure is Sullivan Ballou, a Union soldier during the American Civil War, known for his poignant letter to his wife before the First Battle of Bull Run. The name is also associated with Sullivan County, which exists in several U.S. states, including New York and Pennsylvania, known for its natural beauty and recreational opportunities. In popular culture, Sullivan may refer to Sullivan's Travels, a classic film directed by Preston Sturges, which explores the life of a filmmaker seeking to understand the struggles of the common man. Additionally, Sullivan's Island is a barrier island in South Carolina, famous for its beaches and historical significance.