
You can change file name!
VBA Code
As an example, change the file name of the file “old.txt” to “new.txt”.

Option Explicit
Sub sampleProc()
Dim fso As Object
Dim fileFullPath As String
Dim newFileName As String
'Set "File path before change"
fileFullPath = "C:\Users\user\Desktop\old.txt"
'Set "File name after change"
newFileName = "new.txt"
Set fso = CreateObject("Scripting.FileSystemObject")
'Rename file
fso.GetFile(fileFullPath).Name = newFileName
Set fso = Nothing
End Sub
Result
You changed file name!

FYI
For more information about following, see the following official online manual:
●“GetFile method” of “FileSystemObject”
●“Name property” of “File Object”