Phoebe comes from the Greek phoibē (φοίβη), meaning "bright," "radiant," or "shining." It was an epithet of the moon goddess Artemis and the name of one of the Titans of Greek mythology — grandmother of Apollo and Artemis. The same root gives Phoebus (Apollo's epithet).
Phoebe appears in the New Testament as a deaconess of the early church. Today it sits in the U.S. top 250 and is rising.
Phoebe does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Phoebe reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.