Foy

From a medieval nickname based on Old French foi "faith", applied either to a notably pious person or to one who frequently used the word as an oath; also, from the medieval French female personal name Foy, from Old French foi "faith".

A different form of Fahy (from Irish Gaelic Ó Fathaigh "descendant of Fathach", a personal name probably based on Gaelic fothadh "foundation").

Variant of Fee.