The passage in The Merchant of Venice where Shylock says, "A Daniel! A second Daniel!" is probably an allusion to the story of Susanna, which was probably still familiar to most people in England in Shakespeare's time.
. . . I really DON'T want to start a religious war on this thread though . . . other than to say that Bible names are common in my family and we have some doozies - like all the guys named Nimrod . . . I have four cousins named Nimrod. The tradition in the family is to name the first child Nimrod if it's a boy. When we were pregnant for the first time, my husband was pretty adamant that "no son of mine is going to be named Nimrod!" -- fortunately she turned out to be a girl, so she was named after her two grandmothers and that was AOK.