For this Duncan Jeffrey there are 3 different names on Yasni.
In the ranking of the most common first names Duncan Jeffrey is on position 4588.
Male first name (English): Duncan, brown (haired) warrior; Old Irish (Word format); donn = brown; chadh = the warriors
Male first name (English): Jeffrey, German American (two-part name); gawja = the district, the area; walah = the stranger; friduz = peace, protection, old Germanic two-part name, the Old French form was popular, probably a mixture of several name with the first elements 'gawja' (Gau, area) and 'walah' (the stranger); early with 'Gottfried' confused