Offset's got a few requests in his ongoing paternity case with one of his baby mamas ... and chief among them -- he wants their 4-year-old daughter to have his last name. The Migos rapper filed legal docs, obtained by TMZ, in his case out of Fulton County, Georgia requesting that his daughter, Kalea, take Offset's last name. Offset's gov't name is Kiari Cephus. In docs, Offset says he's the biological father to Kalea, who was born in 2015.