The word "McCosch" is an uncommon spelling for the name "McCosh." It is pronounced /məˈkɑʃ/, with the stress on the second syllable. The spelling of the name "McCosh" has its roots in the Scottish language and is thought to be derived from the Gaelic word "mac an toisich," meaning "son of the chief." Although not a commonly used name, there are several notable individuals with the surname "McCosh," including a former president of Princeton University.