Sinclaire is a surname. Notable people with the name include:Breanna Sinclairé, American transgender singer Bratt Sinclaire, Italian Eurobeat/Italo disco producer Frederick Sinclaire (1881–1954), New Zealand Unitarian minister, pacifist, social critic, university professor and essayist Nikki Sinclaire, British politician Stephanie Sinclaire, also known as Stephanie Crawford, is a painter and director in theatre and film William Sinclaire, American polo player