Elfrida Andrée (1841 – 1929), was a Swedish organist, composer, and conductor. A 1996 recording on the Caprice label features Andrée's piano quintet, along with a piano sonata, the string quartet in D minor, and vocal music. She was a sister of Swedish opera singer-soprano Fredrika Stenhammar.
Octavia Elfrida Saunders was a British academic and one of the first women to achieve a lectureship at the University of St Andrews where she lectured in German. Saunders published under the name O. Elfrida Saunders.
Chieftainess Elfrida Clagg is a character in Harry Potter books. She was a British witch and the Chieftainess of the Wizards' Council either in the fourteenth or seventeenth century. Either way, she was Burdock Muldoon's immediate successor of the post.
― Anonymous User 1/12/2023
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Effie/Effy, Edie, Freddie, Fritzi and Ree could be potential nicknames.
This was the name of a teacher at school - her colleagues called her Elfie. She taught German and the assumption was that she had a German mother, but I don't think that was really so. She was a genuinely lovely person, and because of that I'm rather fond of this name. Although it seemed rather eccentric to me when I was at school, I think it's a rather appealing name, fitting into trends today, and would love to see a little Elfrida. Ellie, Elfie, Elf, Elfin, Frida, Fifi - it has lots of potential nicknames.
https://www.portraitarchiv.ch/portrait?page=134