Macomb is a surname that may refer to the following persons: Alexander Macomb, Sr., Irish-American merchant and land speculator in Detroit and New York; father of Alexander Macomb, U.S. Army general; namesake of Macomb's Purchase Alexander Macomb, Jr., hero of the War of 1812; commanding general of the U.S. Army ; namesake of Macomb County, Michigan David B. Macomb, U.S. Navy rear admiral and engineering officer during the American Civil War; the grandson of William Macomb, merchant; with his cousin William H., namesake of the World War II-era destroyer USS Macomb John Navarre Macomb, Jr., topographical engineer, explorer of the Colorado River, U.S. Army colonel; nephew of Maj. Wikipedia