Gerardo is the Spanish and Italian equivalent of Gerard. Gerard in turn comes from an old Frankish personal name rooted in the Germanic language, derived from the components “gār, gēr” meaning 'spear', and “hard” meaning 'brave, hardy'.
French form of Gislenus, a Latinized form of the Germanic name Gislin, derived from the element gisil meaning "hostage" or "pledge". This was the name of a 7th-century Belgian saint.
The name Ghislaine is a French baby name. In French the meaning of the name Ghislaine is: A French name derived from the Old German 'gisil', meaning pledge.