About the Hanigan surname
The exact origin of the surname Hanigan is not assigned with certainty in this synthesis. The canonical form used here is “Hanigan”; phonetic or spelling differences found in indexes should be checked against the other information in the record. In genealogical research, the earliest forms found in records are the most useful evidence for deciding whether different spellings belong to the same family line.
Pronunciation:
A-ni-gan/aniɡɑ̃/