The word "oregan" is actually a misspelling or variant of the term "Oregon", which is derived from the Columbia River. The river initially got its name from an Anglicization of the Spanish word "orejón". The Spanish explorers gave this name to the river due to the prominent ear ornamentation worn by the local Native American people. Over time, "orejón" evolved into "Oregon", which eventually came to refer to the region as a whole. However, it is worth noting that the origin of the word "orejón" in the Spanish language is not entirely confirmed.