HANIFEN/HANIFIN, HANNIFIN, Hanvey, (MacL: (O)Hanafin
O hAinbhthin now spelt O hAinifin(ainbhioth, “storm”).
Nearly excl. to Co. Kerry.

Woulfe suggests connected with Hanvey of W. Cork.
More Woulfe: HANIFIN, same IRL-Gaelic origins as HANEFAN and HANIFAN, of ” hAINB~T~E¡IN (O’Hanavane), desc. Of Ainb~t~e·n, well known in Cos. Cork and (Ballydavid, Dingle, Castlemain), Kerry}.

I found this on http://www.rootsweb.com/~irlker/surnames.html

Can anyone add more to Hanifin’s Origins.

Dave