Statistics for occurrence #1 of “O'Callaghan” in chapter 13 of Thomas Wentworth Higginson, A book of American explorers:

...from early Dutch chronicles, describing in quaint language the first founding of the New Netherlands. It is translated from Wassenaer's Historie van Europa (Amsterdam, 1621-1632), and is taken from O'Callaghan 's Documentary History of the State of New York, vol. III. pp. 27-28, 42-44. [Hudson sailed from Amsterdam, on his third voyage, March 25, 1609. these extracts are from the diary of R...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
E. B. O'Callaghan 11 7 1 1 0 user votes
E. J. O'Callaghan 6 0 0 0 0 user votes
Edward Bailey O'Callaghan 6 0 0 0 0 user votes
Edmund Bailey O'Callaghan 5 0 1 0 0 user votes
O'Callaghan 4 0 0 0 0 user votes
John O'Callaghan 1 0 1 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.