In fact, they are very different things.
FileCopywill actually create a new copy of the file at the address pathToCopyTo, leaving the original file intact.
Namerenames the source file. Effectively moves the file if you provide a different file path. (The action is copy / paste.) Thus, the source file will not be where you found it, it will be in a new location.
. MSDN:
, Name , . . , , Cut/Paste , Copy/Paste.