Sandara is the stage name of Park Sandara — a modern Korean K-pop formation. Sandara Park (Dara, born 1984) is a Korean K-pop singer-actress — iconic founding member of 2NE1 (2009-2016), one of the K-pop girl groups of the 2nd generation. Solo single Kiss (2009) featured CL.
Sandara 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 Sandara reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.