O’Sullivan
Number of Entries in Birth Indexes for 1890
O’Sullivan
Ireland
136
Leinster
8
Munster
122
Ulster
—
Connaught
6
Counties in which principally found
54 in Kerry, 45 in Cork, and 19 in Limerick.
For an explanation of the above table see Table Explanation.
To find spelling variations and alternatives to particular surnames, see Matheson’s Varieties and Synonymes of Surnames and Christian Names in Ireland.