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I answered my own question. Per an article on a web page called "goARMYsports," the stadium was named for Dennis Mahon Michie:
"Realizing the need for a permanent athletic field as Army's football program continued to assert itself nationally, West Point officials selected a patch of meadow land adjacent to Lusk Reservoir and within the shadow of historic Fort Putnam. Construction of Michie Stadium was completed in 1924, just in time for Army's 35th football campaign……Only 15 Division I-A stadiums, and just six located east of the Mississippi River, are older than fabled Michie Stadium. The original stadium structure was formally dedicated to the memory of Dennis Mahan Michie, who was instrumental in starting the game of football at the U.S. Military Academy in 1890. It was Michie who organized, managed and coached the first football team in history at West Point.
"Dennis Mahan Michie, ... was born at West Point on April 10, 1870. Michie attended Lawrenceville Prep when of high school age and learned to play the game of football quite well. After entering West Point as a member of the Class of 1892, young Dennis contrived a way to bring football to the Academy. While on summer furlough he met a group of Naval Mids, and the topic of football came up. The Naval Academy was anxious to challenge West Point to a game of football, but Michie knew a team from the Academy would never be granted permission to leave post. Secondly, he knew any such challenge would have to originate from the Naval Academy. Consequently, such a challenge was issued and young Dennis brought it to the attention of his father, Lt. Peter Smith Michie, a professor of natural and experimental philosophy at West Point."
Now the question is, from what Michie line did Peter Smith Michie descend?