Family name เดียวดาย (Alone 
, เดียวดาย 
) , all over the world, is a common surname. The family name เดียวดาย is characteristic of India, where it is quite a rare surname, Indonesia, where it is a rare surname, and Philippines. In absolute terms, it is the most numerous in India, Indonesia, and China. Very seldom, เดียวดาย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Alone | Philippines, India, Indonesia, Democratic Republic of the Congo, China |
| เดียวดาย | Thailand |