The weapons are the Masamune, Muramasa, Excalibur, Excalipoor, Zantetsuken, and Bashosen.
http://www.espritduo.com/Gilgamesh%20Repository/FF13-2%20Ultimania%20Omega%20Gilgamesh%20Concept%20Art%20Translated.png --- Like FFVI? Read mah prequel, The Sands of Time! http://www.fanfiction.net/s/6209029/1/Final_Fantasy_VI_The_Sands_of_Time
Their Japanese names are all portmanteaus of the real weapon's name and the word "replica" (like, Gunbreplica, Orihalreplica Bustereplica, etc.)
Going down the list, the real weapons the replicas are based off of are: Orichalcum Excalipoor Excalibur (It's called Excalibur XII, but the blurb states that it, too, is a replica) Zantetsuken Buster Sword Gunblade Brotherhood Wyrmhero Blade (This one appears to be the real deal, not a replica) --- Like FFVI? Read mah prequel, The Sands of Time! http://www.fanfiction.net/s/6209029/1/Final_Fantasy_VI_The_Sands_of_Time