... I mean, yes they do? But the characters themselves are female. You were talking about Mordred. She is female here.

And... every Servant knows every other heroic spirit the moment they get to know names/NP names. It's just kind of part of being a heroic spirit? ^^; Saber didn't know Sasaki Kojirou because he's a composite of different people and one of those people was summoned as a Wraith.

And frankly this comes down to the fact that swords can be prototypes of other swords. People(I mean aside from homunculi and stuff in the Nasuverse) cannot be prototypes of one another.

It'd be a recognition of undergoing similar events, not "oh my god we're the same people as one another at different times".