'10 footballers who have changed allegiance after playing for Ireland':
http://www.thesun.ie/irishsol/homepa...r-Ireland.html
Covers Shane Lowry (Australia), Neil Kilkenny (Australia), Éamon Zayed (Libya), Tony Kane (NI), Callum Morris (NI), Michael O'Connor (NI), Conor Doyle (USA), Patrick Bamford (England), Ryan O'Leary (Scotland) and Daniel Crowley (England).
Not all those players have necessarily formally switched association and most of them have been mentioned in this thread of others, but thought it interesting and worth posting all the same.