It's a knife, because it ‘cuts it’.
That's how I remembered it!
Sharp thinking :P
Like Spanish cuchillo, French couteau.
also tagalog kutsilyo, i guess we got it from the spanish word cuchillo :-))
You are right.
Also, the word Fork in Spanish appears to derive from the object's utility (holder / tenedor), whereas in English, it is the shape of the object that gives it its name. Could be the same for at least "knife"