How to rename objects using a script

I have very little programming knowlege, but I'm trying to make a script that will rename selected objects (paths, shapes, etc). For example, I want to name all the objects selected "vinyl."

This is the code I've been trying and can't get to work:

var docRef = activeDocument;

var sel = docRef.selection;

for (var i=0; i < sel.length; i++)

     sel.name = "vinyl";

I'm using Visual Studio Code with Extendscript and Extendscript Debugger. I've tried saving as a .js and .jsx file. When I run debugging, it doesn't give me any errors, but it also doesn't rename the objects.  What am I doing wrong?