I found a little bit history about ketchup...
"The word ketchup is derived from the Chinese ke-tsiap, a pickled fish sauce. It made its way to Malaysia where it became kechap and ketjap in Indonesia. Seventeenth century English sailors first discovered the delights of this Chinese condiment and brought it west. Ketchup was first mentioned in print around 1690. The Chinese version is actually more akin to a soy or Worcestershire sauce. It gradually went through various changes, particularly with the addition of tomatoes in the 1700s, and by the nineteenth century, ketchup was also known as tomato soy. Early tomato versions were much thinner and more like a soy or Worcestershire sauce. F. & J. Heinz Company began selling tomato ketchup in 1876. By the end of the nineteenth century, tomato ketchup was the primary type of ketchup, and the decriptor of tomato was gradually dropped. Catsup and catchup are acceptable spellings used interchangably with ketchup, but ketchup is the way you will find it listed in the majority of cookbooks."
http://www.kim.com.mk/history.htm
"Word History: The word ketchup exemplifies the types of modifications that can take place in borrowingboth of words and substances. The source of our word ketchup may be the Malay word kchap, possibly taken into Malay from the Cantonese dialect of Chinese. Kchap, like ketchup, was a sauce, but one without tomatoes; rather, it contained fish brine, herbs, and spices. Sailors seem to have brought the sauce to Europe, where it was made with locally available ingredients such as the juice of mushrooms or walnuts. At some unknown point, when the juice of tomatoes was first used, ketchup as we know it was born. But it is important to realize that in the 18th and 19th centuries ketchup was a generic term for sauces whose only common ingredient was vinegar. The word is first recorded in English in 1690 in the form catchup, in 1711 in the form ketchup, and in 1730 in the form catsup. All three spelling variants of this foreign borrowing remain current."
http://www.yourdictionary.com/ahd/k/k0043200.html
