A requested word! Deception may not be what it appears (hee hee hee). The word comes from French decepcion, with the same definition. This, as many French borrowings in English, comes from Latin. Through some conjugations, this can be traced back to the Latin word decipere, which meant "to cheat or trick someone", very similar to deception. Decipere was a portmanteau of de-, "from" and capere, which meant "to take" and is also the root of everything from forceps to intercept. The connection between "take" and "trick" is hard to etymologize; at a glance it doesn't seem to make sense. I researched it a bit further, and some scholars out there believe that there is a philosophical connection between the two because one who decieves is one who "takes" a mind and twists it around to their will. Capere traces to Proto-Italic kapio, and that is reconstructed further to Proto-Indo-European kahp, which could loosely be defined as "grasp", since when you "grasp" something you "take" it. The point of all this is, etymologies can be deceptive.
Adam Aleksic, a rising sophomore studying linguistics and government at Harvard University, has been described as the internet's sixth most famous etymologist. He also has disturbing interests in politics, vexillology, geography, board games, conlanging, and law.