@Arendellecitizen
A user named ThaniBomb leaked a bunch of details about the game a couple months ago on Reddit, much of which has since been confirmed to be real. Though same-sex romances haven't yet been officially confirmed, she said that Dorothea, Edelgard, Mercedes, Rhea, and Sothis would all be romanceable by the female player character, aka Byleth.
@juanelric
Yes, you can choose the protagonist's gender and name in Three Houses. Byleth is the default name.