For this Duncan Guy there are 2 different names on Yasni.
In the ranking of the most common first names Duncan Guy is on position 4589.
Male first name (English): Duncan, brown (haired) warrior; Old Irish (Word format); donn = brown; chadh = the warriors
Male first name (English, French): Guy, Old High (became independent short form); witu = forest; romanized form of 'Wido', the short form of names beginning with 'Wid-' like 'Witold'