Why did they change the Lightning Cutter's name to Chidori? Initially they referred to Kakashi's move as Lighting Cutter (Raikiri), but then they stopped calling it that and called it Chidori from then on.  Any specific reason for this? Seems really odd to change a move's name after establishing it as something else.
The magic of wiki:


  The Lightning Cutter is an enhanced and concentrated form of the
  Chidori with the same effects and drawbacks. According to Might Guy,
  it gained its name after Kakashi split a bolt of lightning with it.
  Because the Chidori is already powerful on its own, the Lightning
  Cutter requires better chakra control, which is exemplified in its
  appearance. The Chidori appears as simply a mass of white electrical
  chakra in the user's hand, while the Lightning Cutter is more focused
  (and blue in the anime).


tl;dr: It's still a Chidori but when Kakashi's using it, it's more refined and famed for cutting a lightning bolt ergo dubbed Raikiri.