Semnakan people

The Semnakan people (Semnakan: Tsi'asamogawo) are a humanoid species native to the planet Semnaka. The average height is 10'3", making them almost twice as tall as humans. They make up the majority of the population of the Semnakan Union.

Etymology
The name Semnaka derives from the word Se'emnaka, which was mistakenly believed to be the name of the planet. They soon realized that it was an inaccurate name since it meant planet in general, but since people already got used to the name, they decided to keep it.

The name Se'emnaka (and thus the derived term Se'emnakagawo) was simplified to make it easier to pronounce, thus the 'e part was removed from the name.