Drennan

Drennan is a surname of Irish origin and is derived from the Gaelic Ó Draighnáin, meaning "grandson of blackthorn". Variant spellings include Drennen, Drinan, Drinnan, Drinnon, Drynan, Thornton (Anglicized) and Drennon.
According to statistics cited by Patrick Hanks, 1,113 people on the island of Great Britain and 592 on the island of Ireland bore the surname Drennan in 2011. In 1881 there were 404 people with the surname in Great Britain, primarily at Renfrewshire, Ayrshire, Lanarkshire, and Lancashire. In mid-19th-century Ireland, people with the surname Drennan were found mainly at County Laois and County Kilkenny. The 2010 United States Census found 4,233 people with the surname Drenna, making it the 7,821st-most-common name in the country. This represented an increase in absolute numbers, but a decrease in relative frequency, from 3,927 (7,811th-most-common) in the 2000 Census.
Notable people with the surname include: