How to rename file names from an excel cell

PatMyer 

OK, I unmarked your reply.

In the workbook with the list of names, press Alt+F11 to activate the Visual Basic Editor.

Select Insert > Module to create a new code module.

Copy the following code into it:

Sub RenameFiles()
    ' Change the path as needed, but keep the trailing backslash
    Const sFolder = "C:\MyFiles\"
    Dim r As Long
    Dim m As Long
    Dim v As Variant
    m = Range("A" & Rows.Count).End(xlUp).Row
    v = Range("A1:B" & m).Value
    On Error GoTo ErrHandler
    For r = 2 To m
        Name sFolder & v(r, 1) & ".png" As sFolder & v(r, 2) & ".png"
    Next r
    Exit Sub
ErrHandler:
    MsgBox "Failed to rename " & v(r, 1), vbInformation
    Resume Next
End Sub

Change the value of the constant sFolder at the beginning of the macro to the full path of the .png files, including the backslash \ at the end.

You might want to test the code on a folder with just a few files to see if it does what you want, before you run it on the folder with all the files.

To run the macro, click anywhere in it and press F5.