The story
They were introduced independently by Elwin Christoffel in 1867 and Hermann Schwarz in 1869.
Etymology from Wiktionary, CC BY-SA 4.0.
Schwarz-Christoffel mapping
Today it means: A conformal map of the upper half-plane or the complex unit disk onto the interior of a simple polygon; used in minimal surfaces, hyperbolic art, and fluid dynamics. Full definition →