The word Taupe derived from the French name for the European Mole, Talpa europaea.
Originally, this referred only to the average color of the French mole , but like the colors pink and lavender, the name expanded (in the case of taupe beginning in the 1940s) to encompass a wide range of varying shades. It seems that this occurred because the color of the fur of the mole can itself exhibit a wide range of shades, from gray through yellowish, brownish, and even purplish.
Taupe is a vague, unscientific color term which may be used to refer to almost any grayish-brown, brownish-gray, or warm gray color. It often overlaps with tan and even people who use color professionally (such as designers and artists) frequently disagree as to what "taupe" means. There is no single, generally recognized authority for such terms.