The person playing in that spot is called "the wicket keeper".
The catcher, and behind the catcher is the Umpire.
The catcher is the person that is behind the batter however if you mean even further then the Catcher then it's the Home Plate Umpire and if you mean even further then next would be the various fans that are in the stands.
A person directly behind the stumps (wicket is fairly ambiguous in cricket use) is normally defined as a wicketkeeper, even if they are not wearing any of the equipment or acting in the usual manner of one.
The person who steers the boat is called a cox, the person who sets the pace is called stroke, then the person behind is called 3 seat, the person behind 3 seat is called 2 seat and then at the back is bow.
there are 11 men in a teqam on the field at one time when fielding and 2 when batting . another person called the twelth man is a spare or is a specialised person so say hes a good bowler but crap batter
the name of a plane driver is called a pilot because its the person behind the wheel of the plane
A hotel receptionist :)