Tracy Morgan wants his estranged wife, Megan, to be a Morgan no more.According to TMZ, the former "SNL" funnyman and his ex's split is shaping up to become nasty, as he's asking that Megan be required to change her last name back to Wollover, her maiden name.Tracy and Megan, who married in 2015, have a prenuptial agreement, but it's not known what's in those documents. The former couple is already likely gearing up for a custody fight over their 7-year-old daughter, Maven — in her July 28