Danish equivalent of Katherine. It was first introduced to the English-speaking world by Scandinavian settlers in America; it has been used in Britain only since the 1940s, but had become very popular by the 1960s.
Origin unidentified. 1. It may be an altered spelling of French Dugard (see Dugar). 2. Alternatively it could be a variant of German Duggert, from an old personal name from Old High German tugan ‘to be capable, competent, or useful’, ‘to be strong’.