The name Siera has its origins in Spanish and Italian cultures, tracing back to the late Middle Ages. It is believed to be a variant spelling of the name Sierra, which itself is derived from the Spanish word "sierra" meaning a jagged mountain range or a saw-like ridge.

In Spain, the name Sierra was initially used as a topographic surname, referring to people who lived near or in the mountains. Over time, it transitioned into a feminine given name, with Siera emerging as an alternative spelling. The earliest recorded instances of the name Siera date back to the 15th century in various Spanish and Italian genealogical records.

One of the earliest known individuals with the name Siera was Siera de la Cruz, a Spanish nun and mystic who lived in the late 15th century. She was known for her spiritual visions and writings, which influenced the religious thought of her time.

In the 17th century, Siera Garibaldi was an Italian noblewoman and philanthropist from Genoa. She dedicated her life to supporting the poor and establishing charitable organizations in her region.

During the 18th century, Siera Montoya was a renowned Spanish painter and portraitist. Her works captured the elegance and grandeur of the Spanish aristocracy, and many of her paintings are preserved in museums throughout Europe.

In the 19th century, Siera Alvarez was a Cuban poet and activist who advocated for women's rights and social reform. Her poetry explored themes of freedom, equality, and the struggle for independence.

Another notable figure was Siera Delgado, a Mexican revolutionary who fought alongside Emiliano Zapata during the Mexican Revolution in the early 20th century. She was known for her bravery and unwavering commitment to the cause of land reform and social justice.

While the name Siera has maintained a presence throughout history, it has never achieved widespread popularity. Its unique spelling and connection to the natural landscape have made it a distinctive and evocative choice for parents seeking a name with a rich cultural heritage.