For this Duncan Jon there are 2 different names on Yasni.
In the ranking of the most common first names Duncan Jon is on position 4589.
Male first name (English): Duncan, brown (haired) warrior; Old Irish (Word format); donn = brown; chadh = the warriors
Male first name (Scandinavian): Jon, Yahweh is gracious, the Lord is good; Hebrew (New Testament): Yahweh = (Name of God); Chanan = favor, be gracious, name of the apostle and evangelist John, also known by John the Baptist; at the end of the Middle Ages, the most common Christian name in Germany, so far contributed 23 popes named John