Anyone born on the island of Ireland before 1 January 2005 or whose parents are Irish automatically qualifies for Irish citizenship. In some cases, those who have an Irish grandparent can also apply. The recent Brexit vote apparently is encouraging many people to consider applying for an Irish passport.
Ancestry.com has reported a 40% surge in new trial memberships in the week since the UK voted to leave the European Union, with daily searches of the site’s Irish records up by 20%. Some Northern Ireland Post Offices ran out of Irish passport applications in the wake of the referendum result.
You can read more in an article by David Young in the Irish Mirror web site at http://goo.gl/jqAmBK.
Information about eligibility for Irish citizenship and an Irish passport may be found at http://goo.gl/k4OcqJ.