Family name คุณธรรม (คุณธรรม 
, Virtanen 
, Virt 
) , all around the world, is a common last name. The family name คุณธรรม is habitual in Northern Europe, particularly Finland, where it is a common surname, Estonia, where it is quite a rare surname, and Sweden. In absolute terms, it most frequently occurs in Finland, Philippines, and Thailand.
| VARIANT | COUNTRY |
|---|---|
| คุณธรรม | Thailand |
| Virtanen | Finland, Philippines, Estonia, Sweden, United States |
| Virt | Czechia, Germany, Estonia, Canada, United States |
| Morallos | Philippines, Canada, United States, Saudi Arabia, United Arab Emirates |