Surname distribution maps for Dirk
Dirk in the 1881 Census
Dirk in the 21st Century
The maps, if available, show both where there are more people named Dirk and where they are most concentrated.
The darker the colour, the more people in that county are named Dirk.
The larger the dot, the greater the proportion of people in that county are named Dirk.
Hovering over the dots will give you the individual statistics for that county.