Did you know that O'Sullivan is one of the most popular Irish names?
The original Irish for the surname Sullivan is O'Suileabhain, but the actual derivation of the name is often disputed. There is no doubt that the root word is 'suil' meaning eye, but whether it is to be taken as 'one-eyed' or 'hawk-eyed' is usually left an open question.
Together the names Sullivan and O'Sullivan rank as the third most frequently found in Ireland. Almost eighty per cent of the (O')Sullivans in Ireland to-day are in counties Cork and Kerry, the remaining being mostly of County Limerick.
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