This small park is named after Private Patrick J. Devanney, a native of the Bronx, who gave his life in World War I. Devanney grew up at 376 143rd Street, and he enlisted in the United States Army at the start of the war. He served as a private in Company E of the 308th Infantry and was wounded in battle. He died on October 3, 1918, just seven weeks before the war ended.
Devanney Triangle is in the historic central Bronx neighborhood of Tremont, which includes the smaller neighborhoods of Claremont, Mount Eden, and Mount Hope. The area was farmland in 1841, when the New York and Harlem Railroad opened a station that soon became the center of a village. In the 1850s, the postmaster, Hiram Tarbox, named the town Tremont, after the three major hills in the area—Fairmount, Mount Eden, and Mount Hope.