Space Empire Name Generator

In practice they are interchangeable, but in fiction they carry different flavors. Empire is the neutral default. Imperium is the Latin root and reads as militarized and ancient, the Warhammer 40k Imperium of Man being the obvious reference. Hegemony means leadership over states that are technically independent, so it suits a core world that controls client systems through treaties and fleets rather than direct rule.

Use a short adjective-noun form for the in-game label (Kaldari Hegemony, Ashfall Empire) and save longer titles for the lore. Make sure the name matches your ethics and civics: a Most Holy Empire should be spiritualist, a Machine Empire of Null should be a machine intelligence, a Hesper-Tann Combine Imperium should be megacorp or mercantile.

All three work, and the choice tells readers something. Species names (Thraxian Dynasty) suggest a monoethnic state; capital names (Empire of Ardanis Prime) suggest a multi-species one held together by a center; ruler or house names (House Vyrenne Dominion) suggest that loyalty runs to a family rather than an idea, which is good setup for a succession war.

Yes. The names are original combinations and invented words, free for any use. A few deliberately echo famous fictional empires in structure only; avoid the exact titles of existing franchises (Galactic Empire, Imperium of Man, Romulan Star Empire) if your work is commercial.