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 | Sweden, Estonia, Philippines, Finland, United States |
| Virt | Germany, Czechia, Estonia, United States, Canada |
| Morallos | Saudi Arabia, United Arab Emirates, Philippines, United States, Canada |