Kimiko

From Memory Alpha, the free Star Trek reference.

"Kimiko" was the name of a fake girlfriend fabricated by Miles O'Brien while working undercover on Farius Prime.

When O'Brien aided Liam Bilby and Krole in hacking a computer system, Bilby offered O'Brien a call girl as a reward. O'Brien turned him down, saying he already had a girlfriend named Kimiko. When pressed by Bilby, who amicably wanted to meet her, O'Brien said that he met her a few days ago and that she worked in a flower shop. (DS9: "Honor Among Thieves")

No doubt inspired by Keiko, to whom O'Brien remained faithful.