In 'Happy Days', what is Fonzie's full name?

Who plays John Dutton in 'Yellowstone'? In 'Downton Abbey', what is the family's surname? In 'Dallas', what is the name of the scheming oil baron? What was the famous cliffhanger question from 'Dallas' in 1980? Which phrase comes from 'Happy Days' and means a show has passed its peak? In 'I Love Lucy', who played Lucy Ricardo? In 'I Love Lucy', what is the name of Lucy's husband? In 'The Andy Griffith Show', in which fictional town is the show set?