http://www.thinkbabynames.com/meaning/1/Frederick Frederick has 39 variant forms: Eric, Erich, Erick, Erico, Erik, Eryk, Federico, Federigo, Fred, Fredd, Freddie, Freddy, Fredek, Frederic, Frederich, Frederico, Frederik, Fredi, Fredric, Fredrick, Fredrik, Frido, Friedel, Friedrich, Friedrick, Fridrich, Fridrick, Fritz, Fritzchen, Fritzi, Fritzl, Fryderky, Ric, Fredro, Rich, Rick, Ricky, Rik and Rikki.