Parent from outside Ireland and UK
If you were born in Ireland on or after 1 January 2005 and neither of your parents were Irish or UK citizens, your entitlement to Irish citizenship by birth depends on your parents’ residence status and history.
One of your parents must have:
Lived in Ireland or Northern Ireland for 3 out of the 4 years before you were born or
Have the right to live in Ireland or Northern Ireland without any restriction on their period of residence