Cognomen Янсен (Jansen 
, Yansen 
, Iansen 
) , all around the world, is a widespread surname. The family name Янсен is habitual in Curacao, where it is a common surname, Netherlands, and Aruba (explore the name in all countries). In absolute terms, the name is most common in Netherlands, Germany, and South Africa. Much less frequently, Янсен is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jansen | Germany, Indonesia, Netherlands, United States, South Africa |
| Yansen | Brazil, Germany, Indonesia, Netherlands, United States |
| Iansen | Brazil, Argentina, Indonesia, United States, Malaysia |
| Янсен | Ukraine, Russia |
| хельми янсен Estonian journalist, feminist, and politician, EE (b. 1889) |
|