Bad Or Just Plain Dumb Band Names

What's up with the bands who take words that begin with C and replace it with a K?

Kamelot
Katatonia
Kreator
Kataklysm (twice; nice)

Is there something wrong with leaving the original letter?
 
Not only Kreator, but all the bands on that list are okay, i don't know what's wrong with replacing 'C' by 'K'.