From the English word felicity meaning "happiness", which ultimately derives from Latin felicitas "good luck".
This was one of the virtue names adopted by the Puritans around the 17th century.
It also appears in the New Testament belonging to the governor of Judea who imprisoned Saint Paul.
From Ferdinando, the old Spanish form of a Germanic name composed of the elements fardi "journey" and nand "daring, brave".
It is derived from Middle English fantasie, which comes (via Norman French and Latin) from Greek φαινω (phaino) "to show, to appear".
This name was used by Victor Hugo for the mother of Cosette in his novel 'Les Misérables' (1862).
The Visigoths brought the name to the Iberian Peninsula, where it entered into the royal families of Spain and Portugal.