The Irish surname Slattery, from the southern province of Munster, is an anglicized form of Gaelic Ó Slat(ar)ra ‘descendant of Slatra’, a byname meaning ‘robust’, ‘strong’, ‘bold’. The name originated in the townland of Ballyslattery in the barony of Tulla Upper in east County Clare. The Slattery coat of arms which shows three red submissive lions against a white background indicates a family that are magnanimous in warfare and yet kind and warm in peace time. A notable bearer of the name is the former Irish rugby football star Fergus Slattery. Today there are approximately 9,000 bearers of the surname Slattery living in The United States.