尹 (Yǐn) is the Mainland transliteration of the Korean surname 윤 (Yoon/Yun) — same character used in both Chinese and Korean writing. 晶 renders 정 (jung). So 尹晶 is the Chinese rendering of a Korean Yoon-jung.
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晶 is three 日 (sun) stacked — literally 'crystal/bright/sparkle.' A common feminine given-name character in both Chinese and Korean naming.
