Morrisseau:
http://www.myheritage.com/FP/genealogyCenter.php?sn=&fsn=&page=1&action=search&query=morrisseau&spelling=dmSoundex&firstName=&gender=any&minBirthYearLimit=&maxBirthYearLimit=&minDeathYearLimit=&maxDeathYearLimit=
O'Reily
http://www.myheritage.com/FP/genealogyCenter.php?sn=&fsn=&page=1&action=search&query=o%27reily&spelling=dmSoundex&firstName=&gender=any&minBirthYearLimit=&maxBirthYearLimit=&minDeathYearLimit=&maxDeathYearLimit=
http://en.wikipedia.org/wiki/East_Breifne
http://en.wikipedia.org/wiki/Breifne
http://freepages.genealogy.rootsweb.com/~mallorybrody/Eire/Annals/ClansFamiliesIrelandScotlandpt2.html