Eos is also used as a masculine name in Greek. Some evidence for this is that Eos is used as a name element in unisex and masculine Greek names, such as Eosphoros/Eosphorus. However, Eos is more common for females. So, I think that the "Gender" of this name should be changed from "Feminine" to "Feminine & Masculine".Sources: https://www.names.org/n/eos/about https://forebears.io/forenames/eos
Sources: https://www.names.org/n/eos/about
https://forebears.io/forenames/eos