The database can be browsed alphabetically. There are four sorting keys (options) provided:

1. Bare form: The nominative case form of the surname minus all prefixes, articles and initial mutations. This is a novel gender-neutral form developed for this project.
2. Base form: The male form of the surname in the nominative case.
3. Ordinary form: The ordinary form of the surname in the nominative case, be it the male, wife or daughter form.
4. Root form: The personal name from which the surname is derived. We use this as a lexical title for each surname cluster.

Example

	Bare form	Base form	Ordinary form	Root form
Male	Briain	Ó Briain	Ó Briain	Brian
Wife	Briain	Ó Briain	Uí Bhriain	Brian
Daughter	Briain	Ó Briain	Ní Bhriain	Brian