<Li> Raymond `` Spike '' Fonzarelli ( Danny Butch ) ( seasons 2 -- 4 ; 4 episodes ) -- Fonzie 's cousin ( often referred to as his nephew , but Fonzie explains that he could n't be his nephew as Fonzie was an only child ) and his copycat . He went on a date with Joanie in `` Not with My Sister , You Do n't . '' Made fleeting appearances before the introduction of Chachi . The kinship between Spike and Chachi was never explained . </Li>
<Li> Raymond `` Spike '' Fonzarelli ( Danny Butch ) ( seasons 2 -- 4 ; 4 episodes ) -- Fonzie 's cousin ( often referred to as his nephew , but Fonzie explains that he could n't be his nephew as Fonzie was an only child ) and his copycat . He went on a date with Joanie in `` Not with My Sister , You Do n't . '' Made fleeting appearances before the introduction of Chachi . The kinship between Spike and Chachi was never explained . </Li>
who played fonzie 's nephew on happy days
who played fonzie 's nephew on happy days
Danny Butch
Danny Butch