From the name of the season, ultimately from Latin autumnus. This name has been in general use since the 1960s.
Poppy
Gender:Feminine
Usage: English
Pronounced:PAHP-ee
From the word for the red flower, derived from Old English popæg.
Sapphire
Gender:Feminine
Usage: English (Modern)
Pronounced:SAF-ie-ər
From the name of the gemstone, typically blue, which is the traditional birthstone of September. It is derived from Greek σάπφειρος (sappheiros), ultimately from the Hebrew word סַפִּיר (sappir).
Willow
Gender:Feminine
Usage: English (Modern)
Pronounced:WIL-o
From the name of the tree, which is ultimately derived from Old English welig.