Silent Sam

/ˌsaɪlənt ˈsæm/

From silent (“speechless, mute”) + Sam (“a diminutive of male given name Samuel”). From ante 1920.

1(informal, sometimes used attributively) A person who seldom or never speaks; a taciturn or unresponsive individual.
2informal, by extensionA machine, device, etc. which operates without making noticeable sound.
3informalA mixed alcoholic beverage, usually containing vodka, a cola soft drink, and other ingredients.