Hong (紅) is the Mandarin Chinese word for "red" — the color of joy, luck, and weddings in Chinese tradition. Also 鴻 (great swan, vast) or 虹 (rainbow).
Hong is widely used in China. Lady Hong (1735-1816) was the Korean Crown Princess who wrote the major memoir The Memoirs of Lady Hyegyeong.
Hong reduces to one — the number of Chinese red.