Aodh/ˈeɪ/, or Áed, is an Irish and Scottish word of Indo-European origin, equivalent to fire in English.Aodh and its many variants is used today in the Irish and Scottish Gaelic languages as a given name for both sexes (though feminine forms are less varied and less common), and in even more variants as a family name. As a family name, the root or a variant may be prefixed by O or Ó (meaning from) or Mac or Mc (meaning son of). The masculine given name Hugh has been used as an anglicised form of Aodh, although the names are entirely etymologically unrelated. It is also the name of a Celtic sun god. A pet form of Áed is Ádhán. A modern Irish form of Ádhán is Aodhán. An older form of Aodhán is Aedán. The name Aodhagán is a double diminutive of Aodh, and a more modern Irish form of Aodhagán is Aogán. An Anglicised form of Aedán is Aidan. Variant forms of this Anglicised name are Edan, Aedan, and Aiden. Feminine forms of the name are 'Aodhnait' and 'Aodhamair'.
^The modern word aodh meaning 'inflammation' or as a phrase with the Irish word for 'itch' (tochas), giving aodh thochais, 'burning itch' or 'urtication' - (Foclóir Gaeilg-Béarla, eds Tomás de Bhaldraithe, Niall Ó Dónaill, Dublin 1977), is clearly cognate with the original meaning.