Teoh is a Chinese family name. It is a romanization of Teochew and Minnan names, including 张 or 張 ( Zhāng, or Cheung). It is also rendered as Tiu, Teo, Tio, Thio, and Tiew.
The romanization "Teo" is the 11th-most-common surname among Chinese Singaporeans, with 46,800 bearers making up 1.9% of that population.
In the United States, the romanization "Tiu" was the most common during the 1990 census, ranked 32,695th overall, and the romanization "Teo" was the most common during the year 2000 census, ranked 26,141st overall.