The name Eamon originated from the Irish Gaelic language and has its roots in ancient Celtic culture. It is a diminutive form of the name Edmund, which is derived from the Old English words "ead" meaning "prosperity" or "fortune" and "mund" meaning "protection." The name Eamon can be traced back to the 9th century AD when it first appeared in ancient Irish manuscripts.

One of the earliest recorded references to the name Eamon can be found in the Annals of Ulster, a chronicle of medieval Irish history. In these annals, an individual named Eamon ua Cennétig, a king of Leinster, is mentioned in the year 841 AD. This suggests that the name was in use among the Irish nobility during that time period.

Throughout the Middle Ages, the name Eamon was popular among the Irish and Scottish Gaelic populations. It was often associated with religious figures and scholars, such as Eamon Ó Dornáin, an Irish priest and poet who lived in the 16th century. Another notable bearer of the name was Eamon Raghallach, a 15th-century Irish chieftain and leader of the Uí Fhailghe dynasty.

In more recent history, the name Eamon gained prominence during the Irish revolutionary period of the early 20th century. Eamon de Valera, an Irish patriot and political leader who served as the third President of Ireland from 1959 to 1973, was a prominent figure who carried the name. His birth name was Edward, but he adopted the Irish form Eamon as a symbol of his commitment to Irish nationalism.

Other famous individuals with the name Eamon include Eamon Dunphy, an Irish broadcaster and author born in 1945, and Eamon Kelly, an Irish actor and comedian born in 1976. In the world of sports, Eamon Zayed, a Libyan-Irish former professional soccer player born in 1983, and Eamon Coghlan, an Irish former track and field athlete born in 1952, have also carried the name.

While not as common as some other Irish names, Eamon has maintained a presence throughout history, particularly within Irish and Scottish Gaelic communities. Its ancient Celtic roots and associations with notable figures in literature, religion, politics, and culture have contributed to its enduring appeal and significance.