Cognomen สินธู (Sintu 
, Sinthu 
, สินธู ) , in the entire world, is quite a rare surname. The family name สินธู is characteristic of Qatar, where it is quite a rare surname, Sri Lanka, and Guatemala. Measured by absolute frequency, it is the most numerous in India, Thailand, and Sri Lanka. Much more frequently, สินธู is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sintu | Bangladesh, South Africa, Thailand, India, Guatemala |
| Sinthu | South Africa, Thailand, India, Sri Lanka, Saudi Arabia |
| สินธู | Thailand |