The 19 surnames begin with Do

• Dobbs (1)
• Dobson (4)
• Doel (2)
• Dolan (1)
• Doley (6)
• Donena (1)
• Doney (1)
• Doran (2)
• Dorrington (1)
• Dougan (1)
• Douglas (1)
• Dovell (1)
• Dowler (1)
• Downer (5)
• Downes (1)
• Downey (2)
• Downing (1)
• Downton (1)
• Dowson (3)