Yu is the pinyin romanisation of several Chinese family names.
"Yu" may represent many different Chinese characters, including 余, 于, 由, 魚 (鱼), 漁, 渔, 楀, 俞, 喻, 兪, 於, 遇, 虞, 郁, 尉, 禹, 游, 尤, 庾, 娛, 娱, and 茹.
The most common of the Yu surnames are 于, 余, and 俞.
Around 0.41% of the population have the surname 余 in 2002 (over five million), and it is most common in Jiangxi, Zhejiang and Fujian provinces.
The 俞 surname represents around 0.12% of China's population.