The name Effy is a girl's name of Greek origin meaning "fair speech". Effy and is often added to user-created lists like Old-Fashioned, Vintage, Retro, Classic, Eclectic, Unusual and Uncommon Names for Girls and discussed in our forums with posts like "Drop your favourite (girls)".
From the experts:
This can be a short form of any Greek girls' name starting with 'Ef', such as Efstraria or Efrosini. It has also been suggested as a possible nickname for Elizabeth.