The name Laci is a diminutive form of the Hungarian name László, which derives from the Slavic name Ladislav. The name László itself is a compound of two Slavic words: "ladu" meaning "glory" and "slavu" meaning "fame" or "renowned." The name Laci has been in use since at least the Middle Ages in Hungary and surrounding regions with cultural ties to the Hungarian people.

In its earliest forms, the name was spelled as Ladizlau or Ladizlaus in Medieval Latin texts and charters. Over time, the spelling evolved into the modern Hungarian form of László, with the diminutive Laci becoming a popular nickname or pet form of the name. The name was particularly favored among the Hungarian nobility and royalty throughout the Middle Ages and Renaissance periods.

One of the earliest recorded bearers of the name Laci was Saint Ladislaus I, also known as László I, who was the King of Hungary from 1077 to 1095. He is revered as a celebrated ruler and military leader, known for his victories against the Cuman and Pecheneg tribes, and his efforts in promoting Christianity in the region.

Another notable figure with the name Laci was László Hunyadi (1433-1457), a Hungarian military leader and son of the renowned John Hunyadi, who played a crucial role in defending Hungary against the Ottoman Empire. Despite his young age, László Hunyadi was known for his bravery and military prowess, earning him the nickname "the Thunderbolt."

In the 19th century, the name Laci was borne by László Tóth (1846-1920), a Hungarian painter and printmaker who was a prominent figure in the Nagybánya Artists' Colony. His works, which often depicted rural scenes and landscapes, are considered important examples of Hungarian Realism and Naturalism.

Another significant bearer of the name was László Moholy-Nagy (1895-1946), a Hungarian painter, photographer, and influential teacher at the Bauhaus school of art and design in Germany. His work in various media, including painting, photography, sculpture, and filmmaking, made him a leading figure in the avant-garde art movements of the early 20th century.

In the realm of literature, the name Laci is associated with the Hungarian writer László Krasznahorkai (born 1954), who is renowned for his unique and experimental literary style. His works, which have been translated into numerous languages, have earned him numerous accolades, including the Man Booker International Prize in 2015.