September. it uses the prefix 'Sept,' Latin for seven, as it was at one point the seventh month in the year.
And Septagon is not a word in the English language. The correct name for a 7-sided polygon is "heptagon." It is derived from "hepta," the Greek word for "seven."
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A 7-sided shape is called a heptagon and not a septagon because the names of polygons are derived from the Greek names for the numbers. The Greek for "seven" is "hepta" - thus a heptagon is a 7-sided figure. If the system for naming polygons had been based on the Latin names for numbers, then a 7-sided polygon might have been called a septagon, since the Latin word for "seven" is "septem," but Latin is not the basis for these names in English.
The correct name in English for a 7-sided polygon is "heptagon." The word "septagon" is used incorrectly by some who do not understand that the names of polygons are derived from Greek, not from Latin. The Latin word for "seven is "septem" but the Greek word is "hexa."
A 7-sided polygon is called a heptagon. The word derived from Greek. If it derived from Latin it might be called a septagon, but that is not the case.
nonagenarian, nonagon, nonahedron, nonane, nonomino, nonupletNonagon
It is Greek meaning 7 sides and its Latin equivalent a septagon also meaning 7 sides