I only know of 5 lightsabers:

The lightsaber of Anakin Skywalker, presented to Luke Skywalker by Ben Kenobi.
The lightsaber of Ben Kenobi.
The lightsaber of Darth Vader.
The lightsaber built by Luke Skywalker.
The lightsaber of Kylo Ren.

One of the worst things about the prequels is that every Joe out there has a lightsaber. That scene when like 100 Jedi storm a bunch of robots with lightsabers is one of the dumbest shots ever (like dudes, pull out Anakin, Ben, and Padme and drop a big bomb, or just drop in expendable clones, Jedi aren’t infantry, they’re supposed to be rare, elite fighters). In the OT (and in VII, hopefully it continues), lightsabers are rare weapons, wielded by a select few and used, for the most part, only in combat against other lightsaber wielders. It added to the lore and mystery of them.