Florence
From the Latin name Florentius, derived from the word meaning blooming. Florence Nightingale was named after the town in Italy where she was born and her fame popularised the name in the 19th Century.

Faye
Fay or Faye is a short form of both Faith and Euphemia, and also an old form of the word faith.
It is also an old version of the French word for fairy found in the name of Arthurian enchantress Morgana le Fay.

Frederick (Freddy)
From the Old German, meaning peaceful ruler. The female form is Frederica.