What does your screenname mean?

Lucien is my take on a more modern version of Luthien. I love philology and I can help but wonder about Tolkien's meanings behind his words and names. Lucien being related to Lucifer and the Morning star (either Venus or Sirius) I put it with Tindomiel which was his word for the time just before dawn. Undomiel is his word for twilight, and I think also related to the star Sirius or Venus, as both are sometimes evening stars. TaDa!