Christiansen is primarily a Scandinavian surname derived from 'Christian's son,' following the Nordic patronymic naming tradition. While traditionally a family name especially common in Denmark and Norway, it occasionally appears as a masculine given name, particularly in families honoring Scandinavian heritage. As a first name, Christiansen embodies both religious significance through its connection to 'Christian' and cultural ties to Nordic ancestry. Its usage as a given name remains relatively rare, making it distinctive for those who bear it. The name carries connotations of tradition, family legacy, and possibly religious devotion, reflecting its origins as a name indicating lineage from a forefather named Christian.

This surname related to Clement is strongly associated with Major League pitcher Roger Clemens, winner of more Cy Young awards than any other pitcher in baseball history, and has a softer sound than Clement. Some variations are Clemen, Clementio, Clemention, and Clemons.

Modernized spelling not enough to revive Karen.