Namesakes
Amalie of Oldenburg
(middle name Frideriki) (f) 1818-1875 
Other Royalty 1836-1862 Greece (queen consort)
Friederike of Hanover
(a.k.a. Frideriki) (f) 1917-1981
Other Royalty 1947-1964 Greece (queen consort)
Sofía of Spain
(middle name Frideriki) (f) 1938-
Other Royalty 1938-1962; 1975-2014 Denmark; Greece; Spain (princess/queen consort)