Who came up with the shape of a star?
No context provided
Who came up with the earliest use of the shape of the five-pointed star?
Egyptian hieroglyph
No context provided
Who came up with the shape of the Star of David?
Tanakh manuscript
Five-pointed star
https://en.wikipedia.org/wiki/Five-pointed%20star
Star of David
https://en.wikipedia.org/wiki/Star%20of%20David
A five-pointed star (☆), geometrically an equilateral concave decagon, is a common ideogram in modern culture.
Five-pointed star
The Egyptian hieroglyph representing "star" had five points (
N14 N14), while the "star" sign in Mesopotamian cuneiform had eight.

Five-pointed star
The Star of David, known in Hebrew as Magen David (מָגֵן דָּוִד‎, transl. "Shield of David"),[a] is a generally-recognized symbol of modern Jewish identity and Judaism.[1]
Star of David
The use of the hexagram in a Jewish context as a possibly meaningful symbol may occur as early as the 11th century, in the decoration of the carpet page of the famous Tanakh manuscript, the Leningrad Codex dated 1008.
Star of David History of Jewish usage
A five-pointed star, geometrically an equilateral concave decagon, is a common ideogram in modern culture. The Egyptian hieroglyph representing "star" had five points, while the "star" sign in Mesopotamian cuneiform had eight. The Star of David, known in Hebrew as Magen David is a generally-recognized symbol of modern Jewish identity and Judaism. The use of the hexagram in a Jewish context as a possibly meaningful symbol may occur as early as the 11th century, in the decoration of the carpet page of the famous Tanakh manuscript, the Leningrad Codex dated 1008.