is an early Irish male given name, which also has the hypocoristic and diminutive forms , , and . The Modern Irish form of the name is ().
In Scottish Gaelic, the name is or . All of the above are often anglicised as Euan, Ewan, Ewen or, less often, Owen. The name in both Goidelic languages is generally considered a derivative of the Greek and Latin name , meaning "noble born".
The derives Eógan from the Primitive Irish *, while others such as (, in 1903) have stated that equates to and Eugene; Dr Rachel Bromwich has commented that is a derivation of the Latin , making these names long-attested in Gaelic areas, yet still based on loan-words. Morgan notes that there are less likely alternative explanations and agrees with Dr Rachel Bromwich that Welsh âÂÂis normally latinized as Eugenius," and "both the Welsh and Irish forms are Latin derivatives".
Eoghan has also been translated into English as "well born", in an example c. 1923, due to this Latin derivation, with the note that in common usage it is usually anglicised to "Eugene". The name corresponds to the Welsh , often spelt in English; as well to Ewen, Ewan and Euan. The most likely and widely accepted origin of the Old Welsh is, like the Old Irish also from Latin .