First released by Shaun Cassidy (US #7 1977).
Other hit version by Eric Carmen, writer (B-side US #19/MOR #6 1978).
From the wiki: “Written by Eric Carmen, ‘Hey Deanie’ was first recorded by Shaun Cassidy and released as a single from his album, Born Late the last week of November, 1977. It became his third and final Top 10 hit, peaking at #7 on the Billboard Hot 100. Carmen would record ‘Hey Deanie’ himself for his 1978 album, Change of Heart, and it was released as the B side to the album’s title track single which went on to become a Top 20 hit in 1978.”
Eric Carmen, “Hey Deanie” (1978):