Cassandra is not Cassandra’s real name.
She has, however, been using the nick on IRC since about 1995.
There are two reasons for this.
Firstly, her initials are CAS.
Secondly, she fancies herself as a prophetess of doom that no-one listens to.
She is also occasionally known as Sesquipedality.
In Maelstrom, she used to play Amelie Dubois, whom she was surprised to discover that a large number of characters really really liked. Given that the character was an attempt to create a very likeable persona, this can be regarded as a success.
Her current character is Andrea Popova, whom she does not envisage other characters liking quite so much.