I knew a really cool moderator on another forum. He had 'Lyth' somewhere in his name. Lux is just my real name in Latin. I needed something to fit it together, so I got Lythilux.
Made it up when I was younger, wanted something techy because internet, but also was fond of playing roguey classes in all my MMOs and wanted something ghostly to match. Geist is spirit in German and I liked it. So I slapped the two together and it's been unique so far.
So, I play this card game called Duel Masters. And around 2008 a set came out which contained this card. It had its name transliterated incorrectly however (プロディジー - Protégé instead of Prodigy), and only around June last year this was corrected, making me lose my link to it :>