For this Duncan Charles William there are 2 different names on Yasni.
In the ranking of the most common first names Duncan Charles William is on position 4589.
Male first name (English): Duncan, brown (haired) warrior; Old Irish (Word format); donn = brown; chadh = the warriors
known early in Germany, for example, by Charlemagne (8th-9th century.); Charles, Old High (Word format); Karal = the man, husband, old German name was but: Male first name (French, English) until the 19th Century in Germany popular
Male first name (English, French): William, Old High (two-part name); willio = the will, determination; helm = helmet, the coverage, coverage, protection, old German two-part name, in the Middle Ages in Europe popular; Name several famous kings, for example, by William the Conqueror, the first Norman king of England