Question: Who was the county named after that Drexell R. Davis was born in?
Context: The Jeff Davis County Courthouse is located in the town of Fort Davis, the seat of Jeff Davis County in the U.S. state of Texas.  The courthouse was constructed between 1910-1911 and added to the National Register of Historic Places in 2002.  The Texas Historical Commission (THC) has also designated the building as a Recorded Texas Historic Landmark since 2000 and, along with the surrounding courthouse square, as a State Antiquities Landmark since 2003.  The surrounding county and county seat, along with the nearby historic frontier fort at Fort Davis National Historic Site, are named after Jefferson Davis, who served as U.S. war secretary at the time of the establishment of the fort and the town, and who would later become president of the Confederate States of America during the Civil War. Shelby County is a county located in the U.S. state of Kentucky.  As of the 2010 census, the population was 42,074.  The county seat is Shelbyville.  The county was founded in 1792 and named for Isaac Shelby, the first Governor of Kentucky. Drexell R. Davis (July 19, 1921 – December 16, 2009) was a Democrat who held several elective offices in Kentucky.  He was born in Shelby County, Kentucky. There are fourteen counties in the U.S. state of Vermont.  These counties together contain 255 political units, or places, including 237 towns, 9 cities, 5 unincorporated areas, and 4 gores.  Each county has a county seat, often referred to as a "shire town."  In 1779, Vermont had two counties.  The western side of the state was called Bennington County and the eastern was called Cumberland County.  In 1781, Cumberland County was separated into three counties in Vermont plus another county named Washington (not the same as the modern Washington County) that eventually became part of New Hampshire.  Today's Washington County was known as Jefferson County from its creation in 1810 until it was renamed in 1814.  Essex County, Orleans County, and Caledonia County are commonly referred to as the "Northeast Kingdom". Catharine is a town in Schuyler County, New York.  The population was 1,930 at the 2000 census.  The town is one of two in the county named after Catherine Montour, a Native American interpreter and leader in the area.  The Town of Catharine is in the southeast part of the county and is north of Elmira, New York. Montour is a town in Schuyler County, New York, United States.  The population was 2,446 at the 2000 census.  The town is one of two towns in the county named after Catherine Montour. Bag Limit is a crime novel written by Steven F. Havill.  It is a first person view story of a reluctant sheriff of Posados County named Bill Gastner. Brighton is a city near Birmingham, Alabama, United States and located just east of Hueytown.  At the 2010 census the population was 2,945.  It is one of four cities in Jefferson County named after cities in Great Britain.  Many of its early settlers were of English descent and named the town after the English tourist and resort city of Brighton which is located on the English Channel. Olin's Bridge, or Olin Bridge, or Olin-Dewey Road Bridge is a covered bridge that carries Dewey Road over the Ashtabula River in Plymouth Township, Ashtabula County, Ohio, United States.  The bridge, one of currently 16 drivable bridges in the county, is a single span Town truss design, and is currently the only bridge in the county named for a family.  The Olin family has owned property next to the bridge since it was built.  Members of the Olin family also operate a small museum and gift shop just east of the bridge at the house previously owned by Joyce Grandbouche.  The bridge’s WGCB number is 35-04-03, and it is located approximately 3.6 mi (5.7 km) east of Ashtabula. Jeff Davis County is a county in the U.S. state of Texas.  As of the 2010 census, its population was 2,342.  Its county seat is Fort Davis.  The county is named for Jefferson Davis, who served as the 23rd United States Secretary of War in the 1850s, and then, during the American Civil War, as President of the Confederate States of America.  Jeff Davis County is easily recognizable for its unique shape; it is a pentagon which has no north-south nor east-west boundaries, save for a six mile line serving as its southern boundary.  it also is the "only" county in the United States that touches a foreign country (Mexico) at a single point.  Jeff Davis is also one of the nine counties that compose the Trans-Pecos region of West Texas.
Answer: Isaac Shelby