Xia is the Mandarin pinyin romanization of the Chinese surname written 夏 in Chinese character.
It is romanized Hsia in Wade–Giles, and Ha in Cantonese.
Xia is the 154th surname in the Song dynasty classic text Hundred Family Surnames.
[1] As of 2008, it is the 66th most common Chinese surname, shared by 3.7 million people.
[2]