Family name เที่ยงเดช (เที่ยงเดช, Tiangdet, Thiangdech 
) , in the entire world, is an extremely rare surname. The cognomen เที่ยงเดช is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thiangdech | Thailand |