The name Elfego has its origins in the Spanish language. It is derived from the Latin name Feligo, which itself comes from the Latin word "felix" meaning "happy" or "fortunate." The name Elfego emerged as a variant spelling in the Spanish language, likely during the Middle Ages.

In the early centuries of the Christian era, the name Feligo was adopted by some Christians, particularly in regions under Roman influence. It was seen as a positive name reflecting the happiness and blessings associated with the Christian faith. Over time, as the name spread to areas with strong Latin roots, such as the Iberian Peninsula, it evolved into various regional spellings including Elfego.

One of the earliest recorded instances of the name Elfego can be found in the 11th century, when a Spanish nobleman named Elfego de Lara (1024-1099) was noted for his military achievements during the Reconquista period. He played a significant role in the Christian reconquest of territories from the Moors in the region of Castile.

Another prominent historical figure with the name Elfego was Elfego Baca (1865-1945), a Hispanic-American lawman and gunfighter from New Mexico. He gained fame for his involvement in several gunfights, particularly the 1884 Frisco Shootout, where he single-handedly held off a group of cowboys for over 30 hours.

In the realm of literature, the name Elfego is associated with the Spanish playwright Elfego de la Alameda (1570-1636), who wrote numerous works for the Spanish Golden Age theater. His plays often explored themes of morality and social commentary.

In the field of religion, Elfego García (1835-1920) was a Mexican Catholic priest and educator who founded several schools and educational institutions in his native country. He was known for his dedication to teaching and promoting education among underprivileged communities.

Another notable figure was Elfego Hernández (1900-1957), a Mexican poet and writer who was part of the Vanguardist movement in Latin American literature. His works explored themes of modernity, identity, and social issues, and he was recognized for his innovative use of language and poetic forms.