cart, cardが語源で、語源的にはcard, chartと同じ。もともとは厚紙に描いたスケッチ。
Punch has the benevolence to announce, that in an early number of his ensuing Volume he will astonish the Parliamentary Committee by the publication of several exquisite designs, to be called Punch's Cartoons! ["Punch," June 24, 1843]Also see -oon.