Let's see...

The Ragnarok Z relic line from ARR which is the upgraded version of the Bravura which references both of the original relic weapons Warrior could wield in FFXI. The quest text even references the fact that the Ragnarok is a great sword in FFXI.

Most of the anima relics from HW start out in a form bearing the name of Empyrean weapons from FFXI, such as the Great Axe starting out with its first finished form being, "Ukonvasara."

This trend continues in all relic lines until the Manderville weapons really (though I've been so put off by XIV these past couple of years that I actually haven't finished one to its current highest progression point). Though some of the weapons from FFXI that were referenced were actually just various strong weapons from different endgame eras in FFXI's history.

The Goblin Bounty Hunter/mercenary, Lamebrix Strikebocks from the last raid series in the Alexander raids shows up again in a Eureka Fate in Eureka Pyros. Why and how did he get there? The world may never know!