Greeks.
the greeks did that
It was Johann Bayer.
Johannes Bayer assigned Greek letters to stars within each constellation in his 1603 star atlas "Uranometria". This naming convention is still used today to identify stars, especially within the Bayer designation system.
ms merkel
The Greek astronomer Claudius Ptolemy played a prominent role in naming stars by assigning them to constellations and giving them Greek letters in his work called the Almagest, which was a comprehensive text on astronomy and mathematical theories. His system of star designation has been influential in astronomy throughout history.
Johann Bayer.
Astronomers
The assignment of Greek letters to stars by astronomers dates back to ancient times. This practice was popularized by the German astronomer Johann Bayer in his star atlas "Uranometria" published in 1603. Bayer assigned Greek letters to stars in each constellation based on their apparent brightness, with the brightest star designated as Alpha, the next brightest as Beta, and so on.
Stars received their names from the ancient Greeks and romans, who observed the constellations and named them after Greek myths.
Athena, Zeus, Poseidon, Apollo (different names though)
Most of the brighter stars were assigned their first systematic names by the German astronomer Johann Bayer in 1603, in his star atlas Uranometria.Most of the constellations are ancient, though the concept of assigning the entire sky, not just the asterisms, to constellations is relatively recent. The current boundaries were set up by Eugene Delporte in 1930.
The first letters of the Greek alphabet are usually given to the brightest stars in the constellation.