well known
compound.someone or something that many people know about or recognize.
compound.an adjectival compound describing a person, place, or thing that is widely recognized or famous within a specific context.
“He is a well known actor in this country.”
“The restaurant is well known for its excellent seafood and friendly service.”
“Although the author is well known among academic circles, her work remains largely undiscovered by the general public.”
use a hyphen (well-known) when it comes before a noun, but no hyphen when it follows a verb.
contrast with 'famous' to show that 'well known' can be neutral or specific to a small group, whereas 'famous' usually implies global or very broad recognition.
when used before a noun as a modifier, the phrase requires a hyphen to link the two words.