Janssen \j(a)-nssen, jan(s)-sen\ as a boy's name is a variant of Janson (Scandinavian), and the meaning of Janssen is "son of Jan".

The baby name Janssen sounds like Jansson and Jansen. Other similar baby names are Hanssen, Benssen, Hansson, Hansen, Jacksen, Jensen, Janzen, Jantzen, Janse, Jaysen, Jasen, Jaisen, Jensson and Tansen.