The name Chrissy is a diminutive or pet form of the name Christine, which is the feminine form of the masculine name Christian. The name Christian derives from the Latin name Christianus, meaning "follower of Christ." This name has its roots in the Greek word "Christos," which translates to "the anointed one" and refers to Jesus Christ.

The name Christine emerged in the Middle Ages as a female variant of the name Christian. It gained popularity throughout Europe, particularly in regions with strong Christian traditions. The diminutive form Chrissy likely originated as a nickname or shortened version used affectionately or informally.

In ancient times, the name Christian was used to identify followers of Christianity, as recorded in the Acts of the Apostles in the New Testament. The earliest recorded use of the name Christine dates back to the 7th century, with Saint Christine of Tyre, a Christian martyr who lived in the 3rd century.

Throughout history, several notable individuals have borne the name Chrissy or its variants. One example is Chrissy Amphlett (1959-2013), an Australian singer-songwriter and lead vocalist of the rock band Divinyls. Another is Chrissy Teigen (born 1985), an American model, author, and television personality.

Other notable individuals with the name include Christine de Pizan (circa 1364-circa 1430), an influential Italian-French author and philosopher during the medieval period, and Christine Keeler (1942-2017), an English model and showgirl who became a pivotal figure in the Profumo affair, a British political scandal in the 1960s.

The name Chrissy has also been associated with fictional characters, such as Chrissy Snow, a character in the popular TV series "Three's Company" played by Suzanne Somers (born 1946), an American actress and businesswoman.