The name Eulalia is derived from the Greek word "eulalos," which means "sweetly speaking" or "beautifully speaking." It is believed to have originated in the Eastern Mediterranean region during ancient times. The name was particularly popular in parts of the Byzantine Empire and later spread to other areas of Europe and the Mediterranean.

One of the earliest known references to the name Eulalia can be found in the ancient Christian martyrology, which records the story of a young girl named Eulalia who was martyred in Merida, Spain, during the Diocletian persecution in the early 4th century. Her martyrdom and subsequent veneration as a saint contributed to the popularity of the name among early Christian communities.

In the Middle Ages, the name Eulalia was widely used across Europe, particularly in regions with strong Christian traditions. It was a popular name among nobility and royalty, as well as among the general population. One notable bearer of the name was Eulalia of Barcelona (c. 1187-1209), a Catalan princess and the wife of King Alfonso II of Portugal.

During the Renaissance period, the name Eulalia continued to be used, although its popularity waned in some regions. One notable figure from this era was Eulalia Anacoreta (c. 1490-1555), a Spanish mystic and author from Valencia.

In the 19th century, the name experienced a resurgence in popularity, particularly in Spain and Latin America. This can be attributed in part to the romanticization of Spanish culture and literature during this period. One famous bearer of the name was Eulalia de Borbón (1864-1958), an Infanta of Spain and a member of the Spanish royal family.

Another notable figure with the name Eulalia was Eulalia Guzmán (1890-1985), a Chilean poet and educator who played a significant role in the literary and cultural life of her country.

Other notable historical figures with the name Eulalia include:

1. Eulalia of Merida (c. 292-304), an early Christian martyr and saint.
2. Eulalia of Barcelona (c. 1187-1209), a Catalan princess and Queen of Portugal.
3. Eulalia Anacoreta (c. 1490-1555), a Spanish mystic and author.
4. Eulalia de Borbón (1864-1958), an Infanta of Spain and member of the Spanish royal family.
5. Eulalia Guzmán (1890-1985), a Chilean poet and educator.