Definition of "ies"

These names […] may form regular plurals; thus, Aes, Bees, Cees, Dees, Ees, Effs, Gees, Aitches, Ies, Jays, Kays, Ells, Ems, Ens, Oes, Pees, Kues, Ars, Esses, Tees, Ues, Vees, Double-ues, Exes, Wies, Zees.

1856, Goold Brown, The First Lines of English Grammar, page 10

to say (full of ees, ies, ues) that plurals are always two or more

1998, Ricardo Corona, "These Esses" ("Esses esses"), in Other Shores (Outras Praias), translated by Ricardo Corona & Charles Perrone