
1) Patronymic surname
Found on
https://www.crosswordclues.com/clue/janson

Janson is an old-style serif typeface named for Dutch punch-cutter and printer Anton Janson (1620–1687). Research in the 1970s and early 1980s, however, concluded that the typeface was the work of a Hungarian punch-cutter, Miklós (Nicholas) Tótfalusi Kis (1650–1702). Tótfalusi Kis traveled to Amsterdam in 1680 to serve as an apprentice unde...
Found on
http://en.wikipedia.org/wiki/Janson
[name] Janson is a Scandinavian patronymic surname, meaning `son of Jan`, derived from Johannes. There are alternate Belgian, Dutch, Danish, Latvian, Norwegian and Swedish spellings. Janson is uncommon as a given name. People with the name Janson or its variants include: ...
Found on
http://en.wikipedia.org/wiki/Janson_(name)

Janson is a cultivated variety of potato.
Found on
http://www.probertencyclopaedia.com/browse/QJ.HTM
No exact match found.