household name
A person, thing, or brand that has become widely popular or commonly known. Because it has made reliable and affordable household appliances for over a decade, the company has become a household name. I knew that winning at the Olympics would change my life, but I didn't realize that I would become a household name!
household word
Something that has become widely popular or commonly known. Due to the widespread adoption of mobile technology, "smartphone" has become a household word.