The lyricist for the song 'My Funny Valentine' is Lorenz HART, a four-letter word. HART was an American songwriter who wrote over 800 songs in his lifetime. He was born in New York City in 1895 and worked with composer Richard Rodgers to create some of the most popular musicals of the 20th century. HART's lyrics are known for their wit and charm, and he is considered one of the greatest lyricists of all time.