Why are there changes in Transformers names? Bluestreak to Silverstreak,Shrapnel to Skrapnel,Trailbreaker to Trailcutter?? What's up with that?
You mean you've never heard of Trademarks?
Long story sort, when a name has to be changed, 9 times out of 10 Hasbro has lost the right to use the name, either it's being used by a competitor, or it's rendered too generic (like when people use "Kleenex" for tissues, or "Legos" for building block).
Another reason why names are changed is purely a cultural one. In most such cases, the name is a derogatory term in the US or the UK. Examples include "Slag" "Slapper" and "Spastic".