ketchup

Ketchup probably comes from Hokkien 膎汁 (kê-chiap), meaning fish sauce, passed into English through Malay kecap, a word for dark savory sauces made from soy, fish, and other ingredients. British traders and sailors picked it up in the late 17th century.

In the 18th century, ketchup referred to all sorts of sauces—made with anchovies, mushrooms, walnuts, or oysters—rather than any single recipe. It wasn't until the late 19th century that the tomato version we know today became the dominant meaning of the word.

Catsup, and the earlier catchup, are alternative English spellings of the same word, with catsup still occasionally used in the U.S.