Cassiopeia is the name of a queen in Greek myth and of the northern constellation named for her.
Cassiopeia arrives bearing one of the most spectacular mythological inheritances in the Western tradition. In Greek legend she was the queen of ancient Ethiopia, wife of King Cepheus and mother of the radiant Andromeda. Her defining trait was a vanity so immense it offended the sea-nymphs the Nereids: she boasted that her daughter — or, in some versions, she herself — was more beautiful than the nymphs, drawing the wrath of Poseidon and sending the sea monster Cetus against her kingdom.
Though punished by being placed in the sky where she perpetually circles the celestial pole, sometimes hung upside down in humiliation, her constellation has become one of the most beloved in the northern sky, its distinctive W-shape visible on almost any clear night at northern latitudes. The name's etymology is debated: some scholars link it to the Greek *kassios*, possibly relating to cinnamon or cassia, paired with *opeia* (face, eye), yielding a rough meaning of "she whose gaze is like cinnamon" — warm, striking, a little dangerous. Others see it as a pre-Greek Aegean name whose meaning has been lost.
It appears in Shakespearean jest — Benedick in *Much Ado About Nothing* swears he would not marry a woman "though she were endowed with all that Adam had left him before he transgressed, she were Cassiopeia." The name also graces one of Saturn's moons and countless stars. In the modern era Cassiopeia has gradually migrated from mythology and astronomy into baby-naming culture, favored by parents who want a name of genuine grandeur without leaning on the overused classical canon.
Cassie or Cassie offer natural, friendly shortenings that ease daily use. It is a name that carries the weight of the cosmos lightly.