Does Cassiopeia mean Virgo?

Is completely different. According to Greek mythology, there are the following legends:

1 Origin of Cassiopeia: The hero Poerxiusi (son of Zeus) rescued Andromeda bound by chains and sacrificed it to Poseidon. Her parents gave their daughter and kingdom to the hero Poerxiusi. Zeus raised four people into the sky to become constellations, with Poerxiusi (Poerxiusi), his daughter (Andromeda) and his parents (Cepheus and Cassiopeia) as rewards.

2 The origin of Virgo: Virgo is also called Virgo. There are three versions of this legend, some are Persephone (the wife of Pluto) and some are Estella, the goddess of justice, also known as astoria. The third version is about the legend of Dionysus, the god of wine. It doesn't seem accurate and misleading!

In short, the two are completely different.