Updated June 9, 2019 Share: Family name origins & meanings Swedish (Dahlén) : ornamental form of Dahl, with the suffix -én, from the Latin adjectival suffix -enius ‘relating to’.Norwegian : variant spelling of the farm name Dalen.German : habitational name from any of various places in Germany named Dahlum, e.g. near Düsseldorf and in Eastphalia.