Yes it is from the Vulgate. As to the original Hebrew I can not say. People often forget Jerome also used the Septuagint as well. For those who do not know the Septuagint was written in Greek during the Ptolemy rule over Egypt.
I very much doubt anyone here has the credential and expertise to answer just where he got the name Lucifer, but I doubt he made it up. I do think the Book I refer to was in Hebrew but he did some mixing in Psalms between the Septuagint and the Hebrew versions. At least one of the Psalms was lost in the Hebrew when the Romans destroyed Jerusalem. There is additional ver. in every Psalm in the Catholic Bible from the Protestant as a result to this very day.
And if we continue this sidetrack we are completely off track from the subject at hand.
I've heard that the 10 Commandments were taken directly from the Egyptian Book of the Dead. Do you know anything about that?