Bella is the Italian word for "beautiful" — both a common adjective and a name in its own right.
Bella is also used as a short form of Isabella, Annabella, and other longer names. Its current popularity surge owes much to the heroine of Stephenie Meyer's Twilight novels, but the name has Italian and Latin roots going back centuries. Today it sits comfortably in the U.S. top 60.
Bella 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 Bella reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.