Cognomen 丹 (丹 
, Dan 
, Тана 
, along with others...) , all over the world, is a prevalent surname. The cognomen 丹 is characteristic of Romania, where it is a common surname, U.S. Virgin Islands, and Israel (explore the name in all countries). Measured by absolute frequency, it is commonest in China, India, and Romania. More frequently, 丹 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dān, 丹 | China |
| Dan | Nigeria, China, Romania, United States, India |
| Тана | Kyrgyzstan, Russia, Bulgaria, Kazakhstan, Ukraine |
| 단 | South Korea |
| Тан | Kyrgyzstan, Russia, Kazakhstan, Ukraine, Armenia |
| Нива | Kazakhstan, Russia, Kyrgyzstan, Ukraine |
| Акаи | Russia |
| Тами | Kazakhstan, Russia |
Akai, Akashi, Akasi, Daan, Dahn, Dana, Dang, Dani, Daniel, Dann, Dano, Dany, Dàn, Dán, Dána, Dáni, Niwa, Tam, Tami, Tan, Tana, Đăng, Δανιήλ, Дан, Дана, Данг, Дани, Даниел, Даниил, Данил, Даниэл, Даниэль, Даниэль, Дэниел, Даниел, Данијел, Данни, Даніель, Данієль, Дейна, Ден, Дэн, Дэна, Дэниел, דיינה, דן, דנה, דני, דניאל, טנה, دان, دانا, دانق, دانيال, دانیال, ডানা, তান, তানা, দানা, たな, タン, ダナ, ダニ, ダニエル, ダン, ドナ, 丹尼, 丹尼尔, 丹氏, 丹羽, 唐娜, 土, 当, 德納, 旦, 明石, 淡, 紅, 达诺, and 錦