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