The name Sonny originated as a nickname derived from the word "son" in English, which itself comes from the Old English "sunu" and the Proto-Germanic "sunuz". It was initially used as a term of endearment or an informal way of addressing a boy or young man, particularly in reference to being someone's son.

In its earliest usage, Sonny was not a formal given name but rather a friendly moniker or pet name. Over time, however, it gained popularity and became an accepted first name in its own right, especially in the United States and other English-speaking countries.

One of the earliest recorded instances of the name Sonny being used as a formal first name dates back to the late 19th century. In 1896, the famous American jazz musician and composer Sonny Greer was born, whose real name was William Alexander Greer Jr. He was a prominent member of Duke Ellington's orchestra and is considered one of the pioneers of jazz drumming.

Another notable figure who bore the name Sonny was Sonny Liston, an American professional boxer who was born in 1932 and became the heavyweight champion of the world in 1962. He was known for his powerful punches and intimidating presence in the ring.

In the realm of literature, Sonny was the name of a character in James Baldwin's 1957 short story "Sonny's Blues," which explored themes of family, addiction, and the struggles of African Americans in Harlem during the 1950s.

One of the most renowned individuals named Sonny was Sonny Rollins, an American jazz saxophonist born in 1930. He is widely regarded as one of the most influential and innovative musicians in the history of jazz, known for his improvisational skills and distinctive sound.

Another notable Sonny was Sonny Ramadhin, a West Indian cricketer born in 1929 in Trinidad and Tobago. He was a pioneering spin bowler who, along with his teammate Alf Valentine, revolutionized the art of spin bowling in the 1950s and made significant contributions to the sport.

While the name Sonny has its roots in English and was initially used as a nickname, it has transcended its humble beginnings and become a widely recognized and accepted first name, particularly in the United States. Its connection to notable figures in various fields, from music and sports to literature, has contributed to its enduring popularity and cultural significance.