First recorded by Smiley Lewis (1954).
Hit version by Fats Domino (US #5/R&B #1 1957).
From the wiki: “‘Blue Monday’ was originally written by Dave Bartholomew (‘I Hear You Knocking‘, ‘My Ding-a-Ling‘), and first recorded by Smiley Lewis in 1954. ‘Blue Monday’ was later popularized in a recording by Fats Domino in 1956, and it became one of the earliest Rhythm & Blues songs to make the Billboard magazine Pop music charts. The song was also featured in the 1956 film The Girl Can’t Help It.”
Fats Domino, “Blue Monday” (1956):