Which second governor was the territory, split into Mississippi and Alabama in 1819, named after? 
Claiborne County, Mississippi:  The county is named after William Claiborne, the second governor of the Mississippi Territory. Mississippi Territory: The Territory of Mississippi was an organized incorporated territory of the United States that existed from April 7, 1798, until December 10, 1817, when the western half of the territory was admitted to the Union as the State of Mississippi and the eastern half became the Alabama Territory until its admittance to the Union as the State of Alabama on December 14, 1819.
i don't know