A Dictionary of the Book of Mormon/Omner, City of
OMNER, CITY OF. A city of the Nephites on the east borders by the sea shore, in other words, a seaport town on the South Atlantic Ocean or Caribbean Sea. It was probably named after Omner, the son of Mosiah, and, if so, we are justified, from the custom of the Nephites, in believing that he was its founder. It fell into the hands of the Lamanites in B. C. 67 (Alma, 51: 26), and undoubtedly again in B. C. 35, (or about that time), though it is not then mentioned by name.