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Also suggests being at peace
康 is a single character that means good health or vigor in Chinese, Japanese Kanji, and old Korean Hanja.
康 can also mean peaceful, at ease, or abundant in some contexts.
Please note that this is rarely seen alone in Japanese Kanji. In Japanese, it is used both for health-related compound words and to denote the kouhou through koushou eras of Japan.
In Korean, this can also be the family name “Kang” (caution: not the only family name romanized as Kang in Korean).