Alfred, Alfredo, Alf, Alfons, Fred, Fredi, Fredy, Freddi, Freddy, Federica, Federico, Fredrik, Frederik, Frederic, Frederick, Friedrich, Frederika, Dirk, Darko, Derek, Derik, Roderik, Den, Demo, Demy, Demi, Demis, Dene, Denes, Dener, Deneli, Dieter