What was the family name in "Designing Women"?

Julia and Suzanne Sugarbaker were the famous sisters of "Designing Women." Julia (played by Dixie Carter) ran the Sugarbaker & Associates design firm from their converted Atlanta mansion. Suzanne, a former beauty queen played by Delta Burke, was a "silent" partner who mostly spent her time reminding everyone about her Miss Georgia World title and spending her ex-husbands' alimony checks.