The name Kelli originated as an anglicized form of the Irish Gaelic name Cailín, which means "young girl" or "little girl." The name has its roots in the Celtic languages spoken in ancient Ireland and parts of Scotland. It was initially a diminutive form of the Irish name Cáel or Cáel, meaning "slender" or "thin."

One of the earliest recorded uses of the name Kelli can be traced back to the 16th century in Ireland. It gained popularity in the English-speaking world during the 20th century as a modern variation of the traditional Irish name Cailín.

Throughout history, several notable individuals have borne the name Kelli. One of the most famous was Kelli O'Hara, an American actress and singer born in 1976. She is best known for her work on Broadway, having starred in musicals such as "The Bridges of Madison County" and "The King and I."

Another prominent figure was Kelli Williams, an American actress born in 1970. She is best known for her role as Lindsay Dole Donnell on the television series "The Practice" and its spin-off "Boston Legal."

In the world of sports, Kelli Kuehne, an American golfer born in 1978, achieved success on the LPGA Tour, winning four tournaments during her career.

The name Kelli also has historical ties to literature. Kelli Marie, an American author born in 1971, is known for her works of fiction and poetry, including the novel "The Journal."

Additionally, Kelli Rae Wilson, an American singer-songwriter born in 1965, made a name for herself in the country music genre, releasing several albums and singles throughout her career.

While the name Kelli originated from the Irish Gaelic language, it has gained widespread popularity and recognition across various cultures and regions, with numerous individuals leaving their mark in various fields throughout history.