Ziggy is a spriggan riding about on a meteorite who summons several other meteorites named Stardust throughout the fight, a clear reference to David Bowie’s one-time stage persona Ziggy Stardust, the eponymous song, and Bowie’s fifth studio album (The Rise and Fall of Ziggy Stardust and the Spiders from Mars). It’s a small tribute, but seeing as Final Fantasy XIV makes very few real-world references with in-world names, it’s notable for its inclusion.
Source: Twinfinite; thanks to Serrenity for the tip!