All over the world, Fionan (Fionan 
) is a very rare masculine forename. The first name Fionan is characteristic of Northern Europe, particularly Ireland, where it is a rare boy's name. Much less frequently, Fionan is the last name as well as the forename.
Foo, Doonan, Gannon, Gorman, Tallon, Horgan, Hussey, Falvey, Obrien, Ogriofa, Maccann, Sheahan, Griffin, O'Healai, Mccarthy, Shanahan, Costello, Clifford, O'Reilly, Comerford, Osullivan, O'Carroll, Donagh, Direen, Keegan, Cronin, Shea, Cann, King, Rice, Ryan, Daly, Magee, Moran, Smyth, Allen, O'Driscoll, Coyle, Keane, Dolan, Lavin, Leahy, Lewis, Lynch, Henry, Murphy, Cahill, Coffey, Burke, and O'Sullivan