Cognomen วิรัก (วิรัก 
, Wirak 
) , all over the world, is a rare surname. The surname วิรัก is habitual in Norway, where it is quite a rare surname, Malaysia, where it is a very rare surname, and Pakistan. In absolute terms, it most frequently occurs in Norway, Pakistan, and the United States. Much less frequently, วิรัก is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| วิรัก | Thailand |
| Wirak | Norway, United States, Malaysia, Thailand, Pakistan |
บัวใหญ, สมหมาย, and เลิศวงศกุล