Okay, so here's an example.
Vitas (born Vitaliy Vladasovich Grachov).
His wife, Svetlana Grachyova.
Their daughter, Alla Grachyova.
Their son, Maxim Grachyov.
Vitas' dad, Vladas Grachov.
Vitas' mother's last name is Grachyova.
So do these last names Grachov and Grachyova have to do with gender? I'm fairly confused here.
Also, shouldn't Svetlana's last name be Grachov since she married Vitas? Or is it different in Russia too?