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Family name ท่านชาย (Sir
, Sirre
, ท่านชาย) , in all the world, is a common last name. The family name ท่านชาย is characteristic of Bhutan, where it is quite a common surname, Maldives, and Taiwan, where it is quite a rare surname. In absolute terms, it most frequently occurs in Bangladesh, China, and Nepal. Very seldom, ท่านชาย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sir | Bangladesh, Nepal, Taiwan, Sri Lanka, China |
| Sirre | Netherlands, Belgium, Gambia, France, Thailand |