Cassei- a play on words of the creator's birthname.
Katsaros- "curly-haired" in Greece.
You may have known her as "Cassei Eden," but Citrus remade the UTAU. A new design is in the making. Voicebank: Citrus-chan made Cassei an ACT1, but due to the terrible errors in the bank, it has been removed. They made an ACT2, which can be found on their old soundcloud. An ACT3 is in progress.