More than 3 million decendants of "Niall of the Nine Hostages, a 5th-century warlord who was head of the most powerful dynasty in ancient Ireland." 800 just in Ireland.
http://news.yahoo.com/s/nm/20060117/sc_nm/science_ireland_dc
http://news.yahoo.com/s/nm/20060117/sc_nm/science_ireland_dc