OEI or Oei can refer to: OEI. Obsidian Entertainment, Inc., a video game developer. Organization of Ibero-American States, known by the Spanish and Portuguese-derived acronym, OEI. Ozarks Entertainment, Inc., a former owner of the Dogpatch USA amusement park in the United States. Oei. Ōei, a Japanese era name spanning from 1394 to 1428. Surname. David Oei, Hong Kong-born American classical pianist. Madame Wellington Koo (born Oei Hui-lan), Chinese-Indonesian international socialite and style icon, briefly First Lady of the Republic of China.
https://en.wikipedia.org/wiki/Oei