Cognomen พระวิษณุ (Vishvas 
, Vishva 
, Vishanu ) , all over the world, is a common last name. The last name พระวิษณุ is characteristic of India, where it is quite a rare surname, Sri Lanka, and Qatar, where it is a rare surname. In absolute terms, it most frequently occurs in India, Sri Lanka, and Saudi Arabia. Likewise, พระวิษณุ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Vishvas | Australia, Malaysia, India, Canada, United States |
| Vishva | United Arab Emirates, India, United States, Sri Lanka, Saudi Arabia |
| Vishanu | United Arab Emirates, Malaysia, India, United States, Saudi Arabia |
| พระวิษณุ | Thailand |
Phra Wissanu, Phrawithun, Prawisnu, and Vishnoi