Delilah comes from the Hebrew Delīlāh (דְּלִילָה), meaning "delicate," "languishing," or — by folk etymology — "she who weakens." In the Book of Judges, Delilah is the Philistine woman who betrayed Samson by cutting his hair.
Despite the biblical association, Delilah has been used as a girl's name for centuries, particularly in the African American community. Today it sits in the U.S.
Delilah 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 Delilah reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.