I have a few ideas!

Kanglā shā: A Meitei mythology creature, that was a sacred guardian beast with the head of a dragon and the body of a lion.
Flora: The sabine goddess of flowers and spring.
Áine: Irish goddess of summer and sovereignty, also associated with the sun and midsummer.
Hesperus: Personification of Venus in the evening.
Sirius: God and personification of said star, the brightest in the night sky.
Nut: Goddess of the sky, stars, cosmos, mothers, astronomy, and the universe.

This were the names I could think of/I found researching, hope you like any!

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Flowers
-Acanthus: A flower that symbolizes fine arts
-Belladonna: A flower that symbolizes silence
-Hyacinth: The purple version of this flower symbolizes sorrow. Also Greek mythology-themed because Prince Hyacinthus was one of Apollo's lovers. Hyacinthus died and Apollo turned his blood into the Hyacinth flower
-Larkspur: A flower that symbolizes levity, lightness, and an open heart
-Zinnia: A flower that symbolizes lasting affection
-Aster: A purple star-shaped flower. Can also be galaxy-themed because "aster" is the ancient Greek word for "star"

Mythology
-Calypso: A sea nymph daughter of Atlas and Pleione. Also galaxy-themed, as Calypso is one of Saturn's moons (Greek)
-Lyra: The lyre of Orpheus. Also galaxy-themed, as Lyra is a lyre-shaped constellation
-Cassiopeia: A vain queen in Greek mythology. Also galaxy-themed, as Cassiopeia is the name of a constellation
-Persephone: A classic. The Greek goddess of spring

Galaxy
-Ephemeris: A timetable indicating where moving celestial bodies will be in relation to background stars
-Zenith: The point in the sky directly overhead

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Cón-bláth: Irish for coneflower
Pink Starlight
Frelsari Stjarnanna: Icelandic for Savior of Stars

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