Quick answer
Sayaka is a girl name.
Meaning and history
From Japanese 沙 ( sa ) meaning "sand" or 紗 ( sa ) meaning "thread, silk" with 也 ( ya ) meaning "also" or 耶 ( ya ), an interjection, combined with 香 ( ka ) meaning "fragrance" or 加 ( ka ) meaning "increase". This name can also be composed of other kanji combinations. It is often written using the hiragana writing system.
Notes and context
Usage: japanese | Japanese Hiragana: さやか; Japanese Katakana: サヤカ