A household name is someone who is widely known and recognized. The crossword solutions for this term are SIS (3 letters), FAMED (5 letters), DAD (3 letters), CELEBRATED (10 letters), COGNOMEN (8 letters), and MEGASTAR (8 letters). These words all describe someone who is well-known, either through their family, their work, or their fame. SIS refers to a sister, FAMED implies that the person is famous, DAD is a father, CELEBRATED means they are honored or praised, COGNOMEN is an additional name given to someone, and MEGASTAR is a term used to describe someone who is extremely popular. All of these words can be used to describe a household name.