Under Section 9 of the Aliens Act, 1935 a person who wishes to assume a name other than that by which he or she was ordinarily known prior to reaching the age of majority is required to obtain a change of name licence from my Department to do so. In order for this name change to take legal effect a deed poll would also need to be executed.
Applicants wishing to apply for a change of name licence are required to submit a written request for a Change of Name Licence application form to the Change of Name Licence Section, Unit 3 - Domestic Residence and Permissions Division, Immigration Service Delivery, Department of Justice, 13-14 Burgh Quay, Dublin 2, D02 XK70.
Detailed information is available on the Immigration Service website at: http://www.inis.gov.ie/en/INIS/Pages/WP07000033.