Sources where all variants of 'Horgan' occur.
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Surname Variant

Found in

Ó h-Argáin Dublin city Electoral Lists (1938-1964)
Horgan Cork and Ross Roman Catholic parish records
Horgan Dublin city Church of Ireland parish records
Horgan Dublin city Electoral Lists (1938-1964)
Horgan Dublin city 1911 census
Horgan Griffith's Valuation
Horgan Dublin city Roman Catholic parish records
Horgan General Register Office birth record
Organ Cork and Ross Roman Catholic parish records
Organ Dublin city Church of Ireland parish records
Organ Dublin city Electoral Lists (1938-1964)
Organ Dublin city 1911 census
Organ 1641 Depositions
Organ Griffith's Valuation
Organ Dublin city Roman Catholic parish records
Organ General Register Office birth record
Orgen General Register Office birth record