Surname distribution maps for Dunigan
We don't have any stats on how common this name is. This is probably because it's very rare in the UK.
Dunigan in the 1881 Census
Dunigan in the 21st Century
The maps, if available, show both where there are more people named Dunigan and where they are most concentrated.
The darker the colour, the more people in that county are named Dunigan.
The larger the dot, the greater the proportion of people in that county are named Dunigan.
Hovering over the dots will give you the individual statistics for that county.