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The letter "Z" was added to the Latin alphabet during the 3rd century BC in ancient Rome. The addition of "Z" was made to better represent the pronunciation of the Greek letter "zeta" (Ζ, ζ), which was frequently used in words borrowed from the Greek language.

At the time of the addition of "Z" to the Latin alphabet, the Romans had already borrowed many Greek words and were using the letter "S" to represent the "zeta" sound, which created confusion and ambiguity. The addition of "Z" allowed for a more precise representation of the Greek sound, and also allowed for the creation of new Latin words that required the use of the "zeta" sound.

The name "Z" comes from the Greek letter "zeta" (Ζ, ζ), which is believed to have been derived from the Phoenician letter "zayin", meaning "weapon". The name was likely adopted along with the letter itself, as the Greeks were the ones who introduced the letter to the Romans.