Sekar is from the Javanese sekar — flower (high-register / Krama Javanese). Sekar is one of the Javanese feminine names — central to traditional Javanese courtly poetry + classical heritage. The sekar tradition refers to the Javanese poetic genre of Sekar Macapat (songs of macapat meters) — one of the forms of Javanese classical literature dating from the 14th century.
Sekar 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.
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In Pythagorean numerology the letters of Sekar reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.