Last name ไวยากรณ์ (ไวยากรณ์ 
, Grammatica 
, Waiyakon ) , around the world, is a rare cognomen. The family name ไวยากรณ์ is characteristic of Italy, where it is a rare surname, Thailand, and France. Very seldom, ไวยากรณ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Waiyakon, ไวยากรณ์ | Thailand |
| Grammatica | Italy, France, United States, United Kingdom, Argentina |