Definitions of southern:

• adjective:   situated in or coming from regions of the south

  Example: "The southern hemisphere"

• adjective:   in or characteristic of a region of the United States south of (approximately) the Mason-Dixon line

  Example: "Southern hospitality"

• adjective:   from the south; used especially of wind

  Example: "Southern breezes"

• adjective:   situated in or oriented toward the south

  Example: "A southern exposure"

• name:  A surname (rare: 1 in 33333 families; popularity rank in the U.S.: #3817)