For this Duncan Oliva there are 2 different names on Yasni.
In the ranking of the most common first names Duncan Oliva is on position 4589.
Male first name (English): Duncan, brown (haired) warrior; Old Irish (Word format); donn = brown; chadh = the warriors
Female first name (Italian): Oliva, the olive tree, olive, Latin (plant); oliva = olive tree, the olive, the olive, because of their background is not directly the feminine form of 'Oliver'