From Japanese 亜 (a) meaning "second, Asia" combined with 古 (ko) meaning "old, ancient", 子 (ko) meaning "child", 心 (ko) meaning "heart, mind, soul", 都 (ko) meaning "capital (city)", 虹 (ko) meaning "rainbow", 恋 (ko) meaning "love" or 湖 (ko) meaning "lake". Other kanji combinations are possible.