Niki Ghazian

"Shahs of Sunset" producers want to school an FHM model on the law -- telling her she has no right to sue over her handle "Persian Barbie" ... because Mattel trademarked the name a looong time ago!! TMZ broke the story ... Persian model Niki Ghazian (above) accused the reality TV show of illegally…

There can only be one "PERSIAN BARBIE" ... so says a smokin' hot model who claims Bravo's show "Shahs of Sunset" is illegally using HER moniker for one of their cast members. Niki Ghazian (left) -- FHM model and self-proclaimed "Persian Barbie" -- fired off a cease and desist letter last week to…