You cannot create two folders with the exact same name within the same folder. As you wish to do this on your desktop, the folders you create are inside the desktop folder. What you could do is place an a,b,c or a number, 1,2, or 3 for each folder which has the same name and you need multiples. For example,
Folder
Foldera
Folderb
or
Folder_a
Folder_b
Folder1
Folder2
Folder_1
You don't want spaces in between your folder names if you are going to access them via a command prompt. If you do, make sure you place the full path name in quotation marks.
To create a folder on your desktop without giving it a name, simply accept the default name New Folder.
To create a folder with the name con, simply type con into the space provided when creating the folder.
When you right click your desktop and select New--Folder, a folder with the default name New Folder is created. It is also ready for data input because usually people do not leave it as New Folder. Where is says New Folder simply type in con.
Now, you can have the same name on folders which are inside of different folders. Lets say you create a folder named System, you can create a sub-folder within that System folder named System too.
So, if you create a folder on your desktop named con, you can then open that folder and create a sub-folder named con.
You can also have a folder named con on your desktop and then place other items in it instead of on the desktop to create a more orderly arrangement.
Hope this helps, good luck.