Jansson is a Swedish patronymic surname, meaning "son of Jan", derived from Johannes, a cognate of John.
There are alternate Belgian, German, Dutch, Danish, Latvian and Norwegian spellings.
Jansson is rare as a given name.
As of 2014, 86.2% of all known bearers of the surname Jansson were residents of Sweden, 5.1% of Finland, 2.9% of the United States and 1.7% of Norway.
In Sweden, the frequency of the surname was higher than national average (1:199) in the following counties: In Finland, the frequency of the surname was higher than national average (1:1,893) in the following regions:[1] Jansson, a C language cross platform (including Unix, and Windows) package capable of encoding, decoding and manipulating JSON data