1) Mad Men actor John 
Slattery is a surname of Irish origin. The name is an anglicisation of the Irish Ó Slatara or Ó Slatraigh, meaning `descendant of slatra` 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 li...