Sayaka (沙也加) is a modern Japanese name meaning "clear and refreshing" or "bright flower." Multiple kanji combinations.
Sayaka Kanda (1986-2021) was the Japanese actress and singer.
Sayaka 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 Sayaka reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.