His parents divorced when Koufax was three years old. Six years later, his mother married Irving Koufax, an attorney. Jack Braun had also remarried, and soon stopped calling his son and paying child support. Koufax took his stepfather's name. Irving Koufax.

"Sandy Koufax Facts." Sandy Koufax Facts. N.p., n.d. Web. 14 Apr. 2015. <http://biography.yourdictionary.com/sandy-koufax>.