Cognomen Jansena (Jansena 
) , in all the world, is a rare family name. The cognomen Jansena is habitual in Latvia, where it is a rare surname, Thailand, and the United States, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Thailand, Latvia, and India. Much less frequently, Jansena is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jansena | Thailand, Brazil, United States, India, Latvia |