E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A corruption of counterpoint, from the Latin cul cita (a wadded wrapper, a quilt). When the stitches were arranged in patterns it was called culcita puncta, which in French became courte-pointe, corrupted into contre-pointe, counter-point, where point is pronounced poyn, corrupted into pane.