The story
Named after Swiss mathematician Leonhard Euler (1707–1783), who did, however, not discover it, although he likely gave the constant its modern symbol e.
Etymology from Wiktionary, CC BY-SA 4.0.
Euler's number
Today it means: The mathematical constant e, the base of the natural logarithm; an irrational, transcendental number approximately equal to 2.71828. Full definition →