rouge

Rouge comes from French rouge, itself from Latin rubeus, meaning red. English actually had a rare medieval cousin of this word, spelled rouge or rouȝ, but the modern word we use wasn't borrowed until around 1750.

Because English first tried this word in the Middle Ages and let it fade, the rouge we use today is really a second borrowing from French, centuries later. The word's later use for certain game senses has an origin the Oxford English Dictionary lists as unknown, so that thread doesn't connect back to the Latin red.

It traces back to the same Latin root, rubeus, meaning red — the same idea of redness that gave French its word for the color.