Definitions of ranger:

• noun:   a member of a military unit trained as shock troops for hit-and-run raids
• noun:   a member of the Texas state highway patrol; formerly a mounted lawman who maintained order on the frontier
• noun:   an official who is responsible for managing and protecting an area of forest
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #16036)