Alternative forms 
Unclear. Possibly from the Irish og-úaim 'point-seam', referring to the seam made by the point of a sharp weapon.
Proper noun 
Usage notes 
The pronunciation /ˈoʊ.əm/ more closely matches the modern Irish pronunciation of the word ([ˈoːmˠ], [ˈoːəmˠ]), but the pronunciation /ˈɒɡəm/, based on the spelling and the Old Irish pronunciation, is also common in English.