In Worlds of Star Trek: Deep Space Nine, Volume 1, Thirishar ch'Thane and Prynn Tenmei note the differences between the names “Andor” and “Andoria.” While Tenmei grew up thinking of ch'Thane’s homeworld as “Andoria,” ch'Thane grew up knowing it as “Andor.” Conversely, ch'Thane grew up thinking of Tenmei’s homeworld as “Terra,” only to discover that Terrans call it “Earth.”

Andoria - Memory Alpha, the Star Trek Wiki

This is so deftly handled, I can do nothing but gape. Kudos to the author in question.

Also apparently both Andor and Andoria are legit names for the place from which Andorians originate? As both as used in the same sentence?

Is one the planet and the other the empire, or…?

Do Andorians even have an empire?