Warhammer 40k Planet Name Generator

Planet names in Warhammer 40,000 carry the weight of the Imperium's ten thousand years of decay. Most worlds are named in High Gothic, the pseudo-Latin of the Adeptus Terra, so ordinal suffixes like Prime, Secundus, Tertius, Majoris and Minoris are everywhere: Armageddon Secundus, Vraks Prime, Sepheris Secundus. Roman-numeral suffixes (Ophelia VII, Gryphonne IV, Stygies VIII) mark a planet's position in its system, a habit inherited from Terran astrocartography.

The best names also hint at what a world is for. Forge worlds sound industrial and Martian (Ryza, Metalica, Graia). Hive worlds sound choked and vast (Necromunda, Verghast, Fenksworld). Death worlds and feral worlds get short, brutal names (Catachan, Krieg, Fenris) while shrine worlds and cardinal worlds lean ecclesiastical (Ophelia VII, Gathalamor, Dimmamar). Names ending in a possessive such as Rynn's World or Salvation's Reach usually commemorate a Rogue Trader, saint or battle, and daemon worlds inside the Eye of Terror twist Gothic roots into something wrong (Sicarus, Medrengard, Sortiarius).

The list above mixes canonical worlds from the setting with original names built on the same rules, so you can drop them into a Crusade campaign, a Dark Heresy sector map or Necromunda hive without breaking tone.