Most Common Surnames in Ulster in 1901

List of the most common surnames in Ulster in 1901. Each surname is followed by the number of people with this surname in Ulster in 1901.

Note: It was common for people to have the first letter of their surname entered into the census in place of their surname, if for example they were residents in a workhouse or a military base. For this reason, single letters make it into the top lists in some instances.