Everything has its origin. You'll just have to look it up somewhere. I'm sure there's some semi-logical explanation.
I can tell you that the original potato chip was created in New York, U.S., I believe sometime in the 19th century.
Americans and Canadians call them "chips". English decided to call them "crisps" because the word "chips" was already being used.
Other countries have their own words for them...partly because they don't speak English...