Only three angels are named in the Bible: Michael, Gabriel and Lucifer. All the other names of angels that we're familiar with come from later works. One of these is Raziel, the keeper of secrets and mysteries who appears in the Kabbalah. He was responsible for recording the deepest secrets of creation in a book, and sat at God's right hand. When Adam and Eve were expelled from Eden, Raziel gave them his book to help them find their way back to Paradise.
The winged Raziel from the Legacy of Kain games bears little resemblance to the cherubic figure of Jewish mysticism. He is a decayed, soul-eating creature, and rather than holding all the answers, he spends the series as an unwitting pawn of greater masters. Still, in the end it is his knowledge that allows Kain to defeat the parasitic Elder God, though it costs him his life in the process. Just as Kain becomes the Scion of Balance in his success, restoring Nosgoth to order, so perhaps does Raziel ascend to his rightful place as a spirit of knowledge.
Unlike the first three entries on this list, Sephiroth isn't a person or a creature, it's a process. The ten Sephirot are the attributes through which God reveals himself. It's a really, really complicated set of theological parameters, so we'll explain it as the different ways in which God manifests himself to reveal his will.
Final Fantasy VII's Sephiroth is one of the series' most popular antagonists, and he lives up to his namesake. His journey is a constant shift in forms, from child, to mutation, to soldier, to murderer, to death and finally to magnificent resurrection in the form of the One-Winged Angel. His goal is a perverted form of enlightenment and divinity where instead of attempting to become one with the universe or God, he attempts to make everything become one with him.
Baraka, too, isn't a figure of Jewish legend. In fact, it's an orthodox word meaning a blessing that is said during specific parts of a ceremony. Barakas can be used to bless food, when carrying out commandments and in praise of God.
Meanwhile...that's Baraka from the Mortal Kombat games up there. A spike-toothed, bald murder mutant with swords embedded in his forearms. Though he's one of the coolest-looking characters in a game full of cool-looking characters, he's little more than a goon who is always the first to get his ass kicked in any showdown between the forces of good and evil.
Strangely, he actually has a fairly solid connection to his name in Jeff Rovin's Mortal Kombat novel. In the book he is actually a priest who presides over Outworldian religious ceremonies. He attempts to kill Sonya Blade and remove her heart in a sacrifice to a messenger dove that got through on time. Not exactly the solemn world of Jewish supplication, but at least there was praying involved.