Grand Marnier Cordon Rouge orange liqueur is the flagship and classic cordial available in just about every bar the world over. Despite murderous variations in pronunciation, it is considered the "essential" ingredient for many cocktails when the snobs sneer at triple-sec. The website currently (April, 2009) claims they sell a bottle every two seconds somewhere in the world.
In a positive review in 2012, Wine Enthusiast mentioned that cocktail geeks "gleefully shorthand" the name to "GrandMa." At 80 proof, we feel that'll be a happy grandma.
Grand Marnier is still produced and run by the same family that founded it 150 years ago: the Marnier Lapastolles. It was founded in 1827 by Jean-Baptiste Lapastolle. The original name was "Curacao Marnier" but was so well-regarded by a friend that it was renamed "Grand Marnier" in the creator's honor: "A grand name for a grand liqueur." The orange liqueurs are a blend or orange flavoring with cognac. They offer various "expressions" based primarily on the age of the cognacs used for the blend.