Ommin in the Star Wars Legends continuity
Ommin was mentioned in Star Wars: The Rise of Skywalker: Expanded Edition, the 2020 novelization of the film of the same name. While the novelization does not explicitly provide the king's name, the audiobook of the novelization uses a slight variation in wording, implying the Ommin harness was named after the king.
In the Star Wars Legends continuity, Ommin was a king of the planet Onderon. He was first mentioned in the second issue of the Star Wars: Tales of the Jedi comic miniseries, written by Tom Veitch, illustrated by Chris Gossett, and published by Dark Horse Comics on November 16, 1993. He first appeared in the first issue of the comic series Star Wars: Tales of the Jedi — The Freedon Nadd Uprising, written by Tom Veitch, illustrated by Tony Akins, and published by Dark Horse Comics on August 2, 1994.