“Upon her return to the United States, Handler redesigned the doll (with help from local inventor-designer Jack Ryan) and the doll was given a new name, Barbie, after Handler’s daughter Barbara. The doll made its debut at the American International Toy Fair in New York City on March 9, 1959.[13] This date is also used as Barbie’s official birthday.“
“Upon her return to the United States, Handler redesigned the doll (with help from local inventor-designer Jack Ryan) and the doll was given a new name, Barbie, after Handler’s daughter Barbara. The doll made its debut at the American International Toy Fair in New York City on March 9, 1959.[13] This date is also used as Barbie’s official birthday.“
-Wikipedia