Fionna \fi(on)-na\ as a girl's name is a variant of Fiona (Irish, Gaelic), and the meaning of Fionna is "fair, pale".

The baby name Fionna sounds like Fina, Fyona, Fione, Ffiona, Vianna, Viona and Vienna. Other similar baby names are Dionna, Gionna, Yionna, Kionna, Rionna and Tionna.