Dalia is from the Arabic داليا — vine, branch — and the Hebrew דַּלְיָה (Daliya — gentle branch, drawn-up). Dalia is one of the Arabic + Hebrew + Lithuanian feminine names.
Dalia 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 Dalia reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.