She in not his wife, but his sister. Victoria was married to another gangland thug. Victoria has taken back to her maiden name.
I don't think Victoria ever took her husband's surname. I read somewhere where she lamented to her father all the trouble she and her kids were in because they were "Gottis". But John Gotti Sr. told her she brought it on herself by keeping the Gotti surname, and not taking her husband's less infamous name.