What was the middle name of US President James K Polk?

James Knox Polk (November 2, 1795 – June 15, 1849) was an American politician who served as the 11th President of the United States (1845–1849). He previously was Speaker of the House of Representatives (1835–1839) and Governor of Tennessee (1839–1841). A protégé of Andrew Jackson, Polk was a member of the Democratic Party and an advocate of Jacksonian democracy. During his presidency, the United States expanded significantly with the annexation of the Republic of Texas, the Oregon Treaty, and the Mexican Cession following the American victory in the Mexican–American War.

James Knox Polk, the first of ten children, was born on November 2, 1795 in a log cabin in what is now Pineville, North Carolina, in Mecklenburg County, to a family of farmers. His father Samuel Polk was a slaveholder, successful farmer, and surveyor of Scots-Irish descent. His mother Jane Polk named her firstborn after her father James Knox. The Polks had migrated to America in the late 1600s, settling initially on the Eastern Shore, then in south-central Pennsylvania and eventually moving to the Carolina hill country.