O’Brien

Robert E. Matheson
1909
Birth Indexes of 1890
Number of Entries in Birth Indexes for 1890
*O’Brien (488)
Ireland
502
Leinster
105
Munster
291
Ulster
56
Connaught
50
Counties in which principally found
Dublin is the only county in Leinster in which found to an appreciable extent. Each county in Munster is largely represented; Cavan takes the lead in Ulster, and Galway in Connaught.

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.