The story
Named after Joseph Louis Lagrange, who discovered the points L₄ and L₅, building on earlier work by Leonhard Euler, and in 1772 published an essay on the three-body problem.
Etymology from Wiktionary, CC BY-SA 4.0.
Lagrange point
Today it means: A point in an orbital configuration of a two-body system where a small object affected only by gravity can theoretically be stationary relative to the two larger objects. Full definition →